---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 05/28/09: 15 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:23 AM - Trouble shooting the Rotax Rectifer/Regulator (ricklach) 2. 08:51 AM - Re: EGT Temps (rampil) 3. 08:55 AM - Re: Trouble shooting the Rotax Rectifer/Regulator (Pete Christensen) 4. 01:18 PM - Re: Trouble shooting the Rotax Rectifer/Regulator (Noel) 5. 02:49 PM - Re: Re: EGT Temps (rparigor@suffolk.lib.ny.us) 6. 03:11 PM - Re: Trouble shooting the Rotax Rectifer/Regulator (Hugh) 7. 03:11 PM - Re: Trouble shooting the Rotax Rectifier/Regulator (Les Goldner) 8. 03:38 PM - Low oil temps on 912ULS (Les Goldner) 9. 04:39 PM - Re: Trouble shooting the Rotax Rectifer/Regulator (Noel) 10. 04:44 PM - Re: Trouble shooting the Rotax Rectifier/Regulator (Noel) 11. 05:13 PM - Re: Low oil temps on 912ULS (Roger Lee) 12. 05:15 PM - Re: Low oil temps on 912ULS (Matt Tucciarone) 13. 06:44 PM - Re: Trouble shooting the Rotax Rectifer/Regulator (TheWanderingWench) 14. 07:25 PM - Re: Trouble shooting the Rotax Rectifer/Regulator (Bob Comperini) 15. 07:39 PM - Re: Trouble shooting the Rotax Rectifer/Regulator (Noel) ________________________________ Message 1 _____________________________________ Time: 08:23:25 AM PST US Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator From: "ricklach" I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? 2. How do you check out the rectifier/regulator? Any help would be greatly appreciated. Rick -------- Rick N35 26.700, W118 16.743 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245707#245707 ________________________________ Message 2 _____________________________________ Time: 08:51:34 AM PST US Subject: RotaxEngines-List: Re: EGT Temps From: "rampil" The book values do not always pan out. I have 4 EGTs in the prescribed spots and seldom see even 1500F on the back cylinders and 1200F in the front. My system is digital and calibrated (Blue Mountain). BTW: Rotax does not recommend EGT monitoring on the 912/912s because there is no way in a stock engine to alter the mixture, and seeing the usual values just makes owner anxious and leads to excess calls to the distributors who can only reassure. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245713#245713 ________________________________ Message 3 _____________________________________ Time: 08:55:03 AM PST US From: "Pete Christensen" Subject: Re: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator Been there, done that, replaced Rectifier/Regulator and that worked. http://www.kitfoxaircraft.com/ has them at a good price. I wasted a week trying to troubleshoot. Pete ----- Original Message ----- From: "ricklach" Sent: Thursday, May 28, 2009 9:22 AM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator > > I am having trouble with the 912 Rectifier/Regulator. It seems to work > fine at first start up and for the next 20 to 30 minutes. But some time > after start-up when the heat of summer soaks in the output start to go > down to what looks like battery voltage of around 11.9 to 12.2. After > looking everywhere and reading all the available manuals I find almost > nothing about how to check out the system. Can anyone help with some good > trouble shooting information like? > > 1. When checking out the engine alternator output do you disconnect the > two leads to check the voltage or just measure it at the > Rectifier/Regulator? > > 2. How do you check out the rectifier/regulator? > Any help would be greatly appreciated. > > Rick > > -------- > Rick > N35 26.700, W118 16.743 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=245707#245707 > > > ________________________________ Message 4 _____________________________________ Time: 01:18:39 PM PST US From: "Noel" Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator The load must be removed from the alternator to read it's output. Remember to use the ACV setting on your meter and the range should be in the neighbourhood of 40VAC. I have never heard of insulation on an alternator breaking down with heat of operation and restoring again once it has cooled down. As I said I've never heard of it but I guess it is possible. The rectifier/ regulator should maintain a 13.8V output. If that changes it may be one of the components of the rectifier /regulator breaking down. Make sure your case is in good contact with the ground and the cooling fins are open to good air flow for cooling. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of ricklach Sent: 28 May 2009 12:53 PM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? 2. How do you check out the rectifier/regulator? Any help would be greatly appreciated. Rick -------- Rick N35 26.700, W118 16.743 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245707#245707 ________________________________ Message 5 _____________________________________ Time: 02:49:31 PM PST US Subject: Re: RotaxEngines-List: Re: EGT Temps From: rparigor@suffolk.lib.ny.us Hi Ira "because there is no way in a stock engine to alter the mixture" Turn off fuel supply and it will lean mixture, that will let you see if you are rich of peak. Ron Parigoris ________________________________ Message 6 _____________________________________ Time: 03:11:05 PM PST US From: "Hugh" Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator Gentlemen: All of a sudden I am seeing a lot of posts concerning trouble shooting the Rotax voltage regulator. Also, a lot of comments that the Rotax regulator is a piece of junk! I don't understand, I have the normal voltage regulator that comes with the Rotax 912UL engine on my Allegro 2000 and have been flying with it for three years. The only monitoring of voltage and current that I have is a dual Voltage/Ampere meter on my panel as well as a red warning light that will come on if I am drawing power from the battery rather than the engine. Under normal operation the volt meter shows about 14 volts. My basic question is how would I know if I was or was not having a problem with the regulator with my set-up? Right now I am assuming that if that little red light comes on the charging voltage from the engine to the regulator and hence to the battery is less than the battery voltage and I am drawing the battery down. If this would ever happen I would land immediately and begin to find out what is causing the low voltage. Is there something I am missing to alert me that my regulator may be going bad? After reading all the posts about this subject I am a little confused. Hugh McKay Allegro 2000 Rotax 912UL N661WW -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Noel Sent: Thursday, May 28, 2009 6:46 PM Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator The load must be removed from the alternator to read it's output. Remember to use the ACV setting on your meter and the range should be in the neighbourhood of 40VAC. I have never heard of insulation on an alternator breaking down with heat of operation and restoring again once it has cooled down. As I said I've never heard of it but I guess it is possible. The rectifier/ regulator should maintain a 13.8V output. If that changes it may be one of the components of the rectifier /regulator breaking down. Make sure your case is in good contact with the ground and the cooling fins are open to good air flow for cooling. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of ricklach Sent: 28 May 2009 12:53 PM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? 2. How do you check out the rectifier/regulator? Any help would be greatly appreciated. Rick -------- Rick N35 26.700, W118 16.743 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245707#245707 Checked by AVG - www.avg.com 08:10:00 ________________________________ Message 7 _____________________________________ Time: 03:11:23 PM PST US From: "Les Goldner" Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifier/Regulator Rick, I am also checking out a 912 voltage problem similar to yours except my voltage stays under 13V regardless of how long I run the engine or at what RPM. You can see the thread of conversation on this subject by looking back about a week in Aeroelectric-list. The problem can be a with the coils in the engine, the wiring (unlikely) or with the voltage regulator (which is known to be of marginal quality). Here is what I checked before coming to the conclusion that the voltage regulator was bad. . Check the coils for shorts by reading the ohms between the two wires coming from the engine (going to the "G" terminals on the voltage regulator) with the engine off. The resistance should be about .7-ohms (probably .5 to 1-ohm is OK). Also check that neither of these wires are grounded. . Check the AC voltage going from the engine to the "G" terminals while the engine is running. Mine was as follows, which the guys at Lockwood told me was just about right: Idle (1900-RPM) was 12.8 volts 2500-RPM was 16.0 v 3000-RPM was 19.0 v 4000-RPM was 24.5 v cruse(5000-RPM)was not measured because the plane would have started rolling. . If the two items above check out, and your wiring is solid, it's a good bet the voltage regulator is bad. Lockwood sells a replacement for about $170 but Bob Nuckolls suggests looking for a better quality alternative to Rotax. Rgds, Les -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of ricklach Sent: Thursday, May 28, 2009 8:23 AM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? 2. How do you check out the rectifier/regulator? Any help would be greatly appreciated. Rick -------- Rick N35 26.700, W118 16.743 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245707#245707 ________________________________ Message 8 _____________________________________ Time: 03:38:05 PM PST US From: "Les Goldner" Subject: RotaxEngines-List: Low oil temps on 912ULS I fly a Zenith CH701 with a 912 ULS engine and my oil temps are running low. Rotax says the operating temps should be between 190 and 230-degrees F. My normal temps with 60-degree outside air run about 130-degrees at about 4800-RPM. I only get in the "normal" range when running near full RPM, about 5250 with my prop setting. I mostly use 91 octane mogas and CPS's semi-synthetic AV-9 motor oil (which is supposed to be designed especially for the 912). Should I be concerned that the oil temps run below the normal range? Les ________________________________ Message 9 _____________________________________ Time: 04:39:44 PM PST US From: "Noel" Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator The alternator on your engine has a finite amount of current it can generate. If you are using too much current the little red light may come on. In that case ti is only telling you that you have too much "stuff" drawing power. If however at the same time you notice the Voltmeter also drops to around 11 V then you know your charging system has gone for a holiday and it would be a good idea for you to head for terra firma. If however you notice that the voltage heads north of 15V it would be a good idea to pull the breaker on the charging circuit and again head for terra firma. If you are quick at noticing these things you can estimate how long your battery will last before your radio and avionics go south. The best thing to do with a low voltage and red light on is to shut off anything electric that is not absolutely necessary to your flight. And continue your trip, landing at a convenient air field. Remember if you are using large quantities of current from the battery you may need a charge to get your engine started again. Spam cans have a slightly different type of alternator which has been discussed. One interesting fact about their little red light is it is an overvoltage light. It comes on if the regulator allows the voltage to go above 15V. At that point a special device turns on the overvoltage light and kicks the alternator offline to protect your avionics. The SOP is to reset the alternator breaker once... if it goes overvoltage again leave it off and find a convenient place to land. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Hugh Sent: 28 May 2009 07:35 PM Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator Gentlemen: All of a sudden I am seeing a lot of posts concerning trouble shooting the Rotax voltage regulator. Also, a lot of comments that the Rotax regulator is a piece of junk! I don't understand, I have the normal voltage regulator that comes with the Rotax 912UL engine on my Allegro 2000 and have been flying with it for three years. The only monitoring of voltage and current that I have is a dual Voltage/Ampere meter on my panel as well as a red warning light that will come on if I am drawing power from the battery rather than the engine. Under normal operation the volt meter shows about 14 volts. My basic question is how would I know if I was or was not having a problem with the regulator with my set-up? Right now I am assuming that if that little red light comes on the charging voltage from the engine to the regulator and hence to the battery is less than the battery voltage and I am drawing the battery down. If this would ever happen I would land immediately and begin to find out what is causing the low voltage. Is there something I am missing to alert me that my regulator may be going bad? After reading all the posts about this subject I am a little confused. Hugh McKay Allegro 2000 Rotax 912UL N661WW -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Noel Sent: Thursday, May 28, 2009 6:46 PM Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator The load must be removed from the alternator to read it's output. Remember to use the ACV setting on your meter and the range should be in the neighbourhood of 40VAC. I have never heard of insulation on an alternator breaking down with heat of operation and restoring again once it has cooled down. As I said I've never heard of it but I guess it is possible. The rectifier/ regulator should maintain a 13.8V output. If that changes it may be one of the components of the rectifier /regulator breaking down. Make sure your case is in good contact with the ground and the cooling fins are open to good air flow for cooling. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of ricklach Sent: 28 May 2009 12:53 PM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? 2. How do you check out the rectifier/regulator? Any help would be greatly appreciated. Rick -------- Rick N35 26.700, W118 16.743 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245707#245707 Checked by AVG - www.avg.com 08:10:00 ________________________________ Message 10 ____________________________________ Time: 04:44:04 PM PST US From: "Noel" Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifier/Regulator If your voltage is consistently 13V regardless of engine rpm the first thing I would do is check the voltmeter in your panel is accurate. Just a thought Noel From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Les Goldner Sent: 28 May 2009 07:41 PM Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifier/Regulator Rick, I am also checking out a 912 voltage problem similar to yours except my voltage stays under 13V regardless of how long I run the engine or at what RPM. You can see the thread of conversation on this subject by looking back about a week in Aeroelectric-list. The problem can be a with the coils in the engine, the wiring (unlikely) or with the voltage regulator (which is known to be of marginal quality). Here is what I checked before coming to the conclusion that the voltage regulator was bad. . Check the coils for shorts by reading the ohms between the two wires coming from the engine (going to the "G" terminals on the voltage regulator) with the engine off. The resistance should be about .7-ohms (probably .5 to 1-ohm is OK). Also check that neither of these wires are grounded. . Check the AC voltage going from the engine to the "G" terminals while the engine is running. Mine was as follows, which the guys at Lockwood told me was just about right: Idle (1900-RPM) was 12.8 volts 2500-RPM was 16.0 v 3000-RPM was 19.0 v 4000-RPM was 24.5 v cruse(5000-RPM)was not measured because the plane would have started rolling. . If the two items above check out, and your wiring is solid, it's a good bet the voltage regulator is bad. Lockwood sells a replacement for about $170 but Bob Nuckolls suggests looking for a better quality alternative to Rotax. Rgds, Les -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of ricklach Sent: Thursday, May 28, 2009 8:23 AM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? 2. How do you check out the rectifier/regulator? Any help would be greatly appreciated. Rick -------- Rick N35 26.700, W118 16.743 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245707#245707 to browse Un/Subscription, Browse, Chat, FAQ, more: http://www.matronics.com/Navigator?RotaxEngines-List Web Forums! http://forums.matronics.com support! http://www.matronics.com/contribution ________________________________ Message 11 ____________________________________ Time: 05:13:33 PM PST US Subject: RotaxEngines-List: Re: Low oil temps on 912ULS From: "Roger Lee" Hi Les, It would be better if your CHT's ran a little higher. First I would set my prop to achieve 5500 rpm. You need to get the temps up so you can burn impurities off the oil and out of the system. The oil temp must be low, too. It is usually around the CHT temp mark depending on how you set the oil and coolant coolers up. You will have a better performing airplane in all aspects and save a little fuel if you bump up your rpm. About 1.5 degrees flatter pitch if you are running 5200-5250 WOT straight and level. This will also help with temps and you will develop more HP at a given rpm , plus you will get better all around flight characteristics. Your engine was designed to run between 4800-5200 rpm with the prop set to achieve 5500 engine rpm WOT. 5000 rpm is peak torque. After 5000 rpm torque starts to drop as HP continues to increase. 60 degrees is a cool day. If you can't bring the temps up then place a piece of 2" wide aluminum tape across the coolant radiator. This is an accepted practice by Rotax. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245797#245797 ________________________________ Message 12 ____________________________________ Time: 05:15:06 PM PST US From: "Matt Tucciarone" Subject: RE: RotaxEngines-List: Low oil temps on 912ULS I had the same problem with my 912s so I bought an external oil thermostat from Lockwood. The oil should be over 190 so that it works correctly in your engine. I have used the thermostat for about 3 years now without any trouble. My oil temp stays around 195. Matt -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Les Goldner Sent: Thursday, May 28, 2009 6:31 PM Subject: RotaxEngines-List: Low oil temps on 912ULS I fly a Zenith CH701 with a 912 ULS engine and my oil temps are running low. Rotax says the operating temps should be between 190 and 230-degrees F. My normal temps with 60-degree outside air run about 130-degrees at about 4800-RPM. I only get in the "normal" range when running near full RPM, about 5250 with my prop setting. I mostly use 91 octane mogas and CPS's semi-synthetic AV-9 motor oil (which is supposed to be designed especially for the 912). Should I be concerned that the oil temps run below the normal range? Les ________________________________ Message 13 ____________________________________ Time: 06:44:13 PM PST US From: TheWanderingWench Subject: Re: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator On a Rotax 503 DCDI: If you're having low (and sometimes 0 ) voltage number s between the rectifier and the engine (from the rectifier forward to the b attery, all numbers are right on,) could that indicate a problem with the e ngine lighting coils? Also, what OHM reading should I be getting from the engine lighting coils? Thanks for your help - ArtySandy, Oregon www.LessonsFromTheEdge.com/uladventure2009.htm =0A =0A"Life's a daring adventure or nothing" =0A Helen Keller =0A =0A"I refuse to tip toe through life just to arrive safely at death." --- On Thu, 5/28/09, Pete Christensen wro te: From: Pete Christensen Subject: Re: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulat or sen@sbcglobal.net> Been there, done that, replaced Rectifier/Regulator and that worked. http:/ /www.kitfoxaircraft.com/ has them at a good price.- I wasted a week tryin g to troubleshoot. Pete ----- Original Message ----- From: "ricklach" Sent: Thursday, May 28, 2009 9:22 AM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator > > I am having trouble with the 912 Rectifier/Regulator. It seems to work fi ne at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to w hat looks like battery voltage of around 11.9 to 12.2. After looking everyw here and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting in formation like? > > 1. When checking out the engine alternator output do you disconnect the t wo leads to check the voltage or just measure it at the Rectifier/Regulator ? > > 2. How do you check out the rectifier/regulator? > Any help would be greatly appreciated. > > Rick > > -------- > Rick > N35 26.700,- W118 16.743 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=245707#245707 > > > > > > > > > > le, List Admin. ________________________________ Message 14 ____________________________________ Time: 07:25:11 PM PST US From: Bob Comperini Subject: Re: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator On 06:43 PM 5/28/2009, TheWanderingWench wrote: >On a Rotax 503 DCDI: If you're having low (and sometimes 0 ) voltage numbers between the rectifier and the engine (from the rectifier forward to the battery, all numbers are right on,) could that indicate a problem with the engine lighting coils? > >Also, what OHM reading should I be getting from the engine lighting coils? http://www.theultralightplace.com/electrical.htm -- Bob Comperini e-mail: bob@fly-ul.com WWW: http://www.fly-ul.com ________________________________ Message 15 ____________________________________ Time: 07:39:36 PM PST US From: "Noel" Subject: RE: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator One of the responses I think said around .7 Ohm. Most Ohm meters will not read that small a resistance accurately. Generally coils can only really be tested for continuity with an Ohm meter. To do a proper test you need an AC source for the meter similar to the buzz box used to set points on the old ignition coils. With the AC, a good coil will develop a high impedance which is easy to meter. Any short in the coil will result in a low impedance and also will be picked up by the meter. Noel From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of TheWanderingWench Sent: 28 May 2009 11:13 PM Subject: Re: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator On a Rotax 503 DCDI: If you're having low (and sometimes 0 ) voltage numbers between the rectifier and the engine (from the rectifier forward to the battery, all numbers are right on,) could that indicate a problem with the engine lighting coils? Also, what OHM reading should I be getting from the engine lighting coils? Thanks for your help - Arty Sandy, Oregon www.LessonsFromTheEdge.com/uladventure2009.htm "Life's a daring adventure or nothing" Helen Keller "I refuse to tip toe through life just to arrive safely at death." --- On Thu, 5/28/09, Pete Christensen wrote: From: Pete Christensen Subject: Re: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator Been there, done that, replaced Rectifier/Regulator and that worked. http://www.kitfoxaircraft.com/ has them at a good price. I wasted a week trying to troubleshoot. Pete ----- Original Message ----- From: "ricklach" Sent: Thursday, May 28, 2009 9:22 AM Subject: RotaxEngines-List: Trouble shooting the Rotax Rectifer/Regulator > > I am having trouble with the 912 Rectifier/Regulator. It seems to work fine at first start up and for the next 20 to 30 minutes. But some time after start-up when the heat of summer soaks in the output start to go down to what looks like battery voltage of around 11.9 to 12.2. After looking everywhere and reading all the available manuals I find almost nothing about how to check out the system. Can anyone help with some good trouble shooting information like? > > 1. When checking out the engine alternator output do you disconnect the two leads to check the voltage or just measure it at the Rectifier/Regulator? > > 2. How do you check out the rectifier/regulator? > Any help would be greatly appreciated. > > Rick > > -------- > Rick > N35 26.700, W118 16.743 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=245707#245707 > > > > > > > http://www.matronics.com/Navigator? http://forums.maref "http://www.matronics.com/contribution" ====== ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.