---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 06/23/05: 17 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:31 AM - Re: Load Analysis Revisited (John Schroeder) 2. 06:22 AM - Re: Intercom / Iso Amp Connection (Matthew Brandes) 3. 06:29 AM - Re: How many busses? (Robert L. Nuckolls, III) 4. 06:49 AM - Re: How many busses? (OldBob Siegfried) 5. 10:20 AM - Re: Connection to main bus (Dave Morris) 6. 03:21 PM - D Sub connector pin out question (Charlie Kuss) 7. 03:58 PM - Re: D Sub connector pin out question (Franz Fux) 8. 04:02 PM - Re: Connection to main bus (Fiveonepw@aol.com) 9. 04:40 PM - Re: Connection to main bus (Robert L. Nuckolls, III) 10. 04:43 PM - Re: D Sub connector pin out question (D Wysong) 11. 04:49 PM - Re: How many busses? (Robert L. Nuckolls, III) 12. 04:57 PM - Re: D Sub connector pin out question (Robert L. Nuckolls, III) 13. 06:50 PM - Re: Aux Batter Management Module (Robert L. Nuckolls, III) 14. 07:33 PM - Help - low voltage (Mike & Lee Anne Wiebe) 15. 08:31 PM - Re: D Sub connector pin out question (Charlie Kuss) 16. 08:37 PM - Re: Battery charger/desulphator (Robert L. Nuckolls, III) 17. 08:56 PM - Re: Help - low voltage (mprather) ________________________________ Message 1 _____________________________________ Time: 05:31:45 AM PST US Subject: Re: AeroElectric-List: Load Analysis Revisited From: "John Schroeder" --> AeroElectric-List message posted by: "John Schroeder" On Wed, 22 Jun 2005 21:55:05 -0500, Emrath wrote: > What about the Garmin Audio Panel? We measured it to be 0.56 amps John Schroeder PS: I'd keep the 430 on the E buss and try not to transmit much. :-)) -- ________________________________ Message 2 _____________________________________ Time: 06:22:19 AM PST US From: "Matthew Brandes" Subject: AeroElectric-List: RE: Intercom / Iso Amp Connection --> AeroElectric-List message posted by: "Matthew Brandes" Thanks Charlie... I knew I would get asked what devices, most are warning tone inputs. PM 501 Intercom (4-place, one input for Aux/Music) KX 155 Nav/Com (Audio) KLN 89B GPS (Tone) Marker Beacon (RST) (Tones) Low Level Fuel Warning (Tone) EIS 4000 Engine Monitor (Tone) MP3 Player (Audio) and any future device? Trying to figure out how to wire/combine all these tone generators into my audio. The DIY ISO Amp has 5 inputs. If I run my MP3 as mono, I can get all into one ISO Amp but then what happens if I have one more device? (PS - I have NO electronics skill whatsoever.. I have a very basic understanding) Matthew Brandes, Van's RV-9A (Finish Kit) #90569 http://www.n523rv.com EAA Chapter 1329 President EAA Chapter 868 Web Editor > Time: 06:14:17 PM PST US > From: Charlie England > Subject: Re: AeroElectric-List: Intercom / Iso Amp Connection > > --> AeroElectric-List message posted by: Charlie England > > > Matthew Brandes wrote: > > >--> AeroElectric-List message posted by: "Matthew Brandes" > > > > >I'm trying to wrap my head around my audio setup. I've just > read the DIY > >ISO Amp document as well as the new Chapter 18 on Audio > systems. I think I > >have it figured out but I do have two questions. > > > >Can I output the audio from one of the DIY isolation > amplifiers INTO a MIC > >input on my PM 501 Mono Intercom?? I think the output of a > microphone is > >much less than most devices. > > > >How do I wire the stereo output (MP3) into a mono input (ISO > Amp). I have 4 > >devices that generate tones so that doesn't leave me with > two inputs on the > >ISO Amp for stereo input. Since everything else is mono, I don't > >particularly require stereo, so would like to just wire both > channels of > >stereo into a single mono connection. > > > > > >Matthew Brandes, > >Van's RV-9A (Finish Kit) > >#90569 > > http://www.n523rv.com > > > > Hi Matthew, > > Not likely to be a good idea to feed the iso amp into a mic > input; the > mic input has much higher gain than the regular audio inputs. > Unsure why > you might need to do that; do you need extra inputs? Other > options are > available to do this if needed. > > You can make a 'summing' combiner using 2 each 10k ohm resistors, one > on each mp3 output & the other ends tied together to feed into the > destination. > > If you don't mind me asking, what are the other sources you > are feeding > into the iso amp? (The reason for asking is that most stuff > doesn't need > the amp; it's usually just needed for consumer audio gear > like the mp3 > player.) > > Charlie > > > > ________________________________ Message 3 _____________________________________ Time: 06:29:48 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: How many busses? --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 12:47 AM 6/23/2005 -0400, you wrote: >--> AeroElectric-List message posted by: Speedy11@aol.com > >I'm going to have about six groups of three each P&B W-31 switch circuit >breakers in my RV-8A. No need to address the fact I'm using CBs instead >of fuses. > I understand those reasons, but I want to use CBs. >What I need to know is whether or not each group of three CBs should be >called a buss? Or should I call multiple groups of 3 each CBs a >buss? Does it >really matter? Any problem with having, say, six "busses?" A "bus" is a common feeder for two or more power taps. It's not uncommon for a breaker panel to have multiple rows of breakers stacked one above the other with a single bus conductor that zig-zags down the column of rows supplying a ONE PIECE means of distributing power to all of the breakers. The term "bus" is an electrical term, not a mechanical term. Bob . . . ________________________________ Message 4 _____________________________________ Time: 06:49:48 AM PST US From: OldBob Siegfried Subject: Re: AeroElectric-List: How many busses? --> AeroElectric-List message posted by: OldBob Siegfried Good Morning Bob, Just a small question concerning proper technical English. I note that Speedy 11 has used the term 'Buss' as in Buss Bar where you use the term 'Bus' for the same purpose. It is my very shaky recollection that I was taught many years ago that when referring to an electrical device, the spelling 'buss' was proper. Were we oldsters taught wrong, has the convention changed, do we remember wrong, or is it of absolutely no significance whatsoever? I did check my dictionary and the only listing it has for 'buss' is as an old English substitute for a kiss. Happy Skies, Old Bob Stearman 3977A --- "Robert L. Nuckolls, III" wrote: > --> AeroElectric-List message posted by: "Robert L. > Nuckolls, III" > > At 12:47 AM 6/23/2005 -0400, you wrote: > > >--> AeroElectric-List message posted by: > Speedy11@aol.com > > > >I'm going to have about six groups of three each > P&B W-31 switch circuit > >breakers in my RV-8A. No need to address the fact > I'm using CBs instead > >of fuses. > > I understand those reasons, but I want to use > CBs. > >What I need to know is whether or not each group of > three CBs should be > >called a buss? Or should I call multiple groups of > 3 each CBs a > >buss? Does it > >really matter? Any problem with having, say, six > "busses?" > > A "bus" is a common feeder for two or more power > taps. > It's not uncommon for a breaker panel to have > multiple > rows of breakers stacked one above the other with > a > single bus conductor that zig-zags down the > column of > rows supplying a ONE PIECE means of distributing > power > to all of the breakers. The term "bus" is an > electrical > term, not a mechanical term. > > Bob . . . > > > > browse > Subscriptions page, > FAQ, > > > > > > ________________________________ Message 5 _____________________________________ Time: 10:20:56 AM PST US From: Dave Morris Subject: Re: AeroElectric-List: Connection to main bus --> AeroElectric-List message posted by: Dave Morris Why is that? Do you think the material might not stand up to heat? I presumed that since they are manufactured by 3 or 4 different companies for racing applications, they are probably pretty good. Dave Morris At 10:17 PM 6/22/2005, you wrote: >--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" > > > > >Use one of these http://www.quickcar.net/electric/57700.html to get the > >high current wire through the firewall. > > > These are very useful if you don't want your firewall to be > a firewall anymore but simply a temporary barrier between > you and smelly things going on up front. > > See: > >http://aeroelectric.com/articles/Firewall_Penetration/firewall.html > >and > >http://www.epm-avcorp.com/tubeseal.html > > Bob . . . > > ________________________________ Message 6 _____________________________________ Time: 03:21:24 PM PST US From: Charlie Kuss Subject: AeroElectric-List: D Sub connector pin out question --> AeroElectric-List message posted by: Charlie Kuss Bob & Listers, I'm drawing up several wiring schematics for my RV-8A using AutoCAD. A number of items in my system use 9, 15 or 25 pin D Subminature connectors. The manufacturer manuals show that pin number one is on the top (wider) row, left hand side. My question is: How is this viewed? Am I looking at the rear of the connector? Which connector, the male or the female? Charlie Kuss ________________________________ Message 7 _____________________________________ Time: 03:58:45 PM PST US From: "Franz Fux" Subject: RE: AeroElectric-List: D Sub connector pin out question --> AeroElectric-List message posted by: "Franz Fux" I believe it is from the back, if you have the connectors already check the back, most of them are numbered Franz -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Charlie Kuss Subject: AeroElectric-List: D Sub connector pin out question --> AeroElectric-List message posted by: Charlie Kuss Bob & Listers, I'm drawing up several wiring schematics for my RV-8A using AutoCAD. A number of items in my system use 9, 15 or 25 pin D Subminature connectors. The manufacturer manuals show that pin number one is on the top (wider) row, left hand side. My question is: How is this viewed? Am I looking at the rear of the connector? Which connector, the male or the female? Charlie Kuss -- -- ________________________________ Message 8 _____________________________________ Time: 04:02:35 PM PST US From: Fiveonepw@aol.com Subject: Re: AeroElectric-List: Connection to main bus --> AeroElectric-List message posted by: Fiveonepw@aol.com In a message dated 06/23/2005 11:22:36 AM Central Standard Time, BigD@DaveMorris.com writes: Why is that? Do you think the material might not stand up to heat? >>> My guess would be risk- I'd think fire in a race car is quickly detected followed by rapid egress from vehicle and dudes in fire suits blasting away- how fast can you get out of an RV at 8000'? How long do you think the plastic insulator will last? (well, it LOOKS like plastic) If ceramic, it might outlast the fire... Mark Phillips ________________________________ Message 9 _____________________________________ Time: 04:40:03 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Connection to main bus --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 12:19 PM 6/23/2005 -0500, you wrote: >--> AeroElectric-List message posted by: Dave Morris > >Why is that? Do you think the material might not stand up to heat? I >presumed that since they are manufactured by 3 or 4 different companies for >racing applications, they are probably pretty good. What's "pretty good"? For us to put a hole in the firewall of a certified ship, the penetration hardware has to stand off a fuel fed fire for 10 minutes as I recall. We have propane fueled test tool for proving the technology being considered. I believe a thermocouple mounted an inch or so off the firewall surface is maintained at or above 2,000F for the duration of the test. There are no plastics I'm aware of that will pass this test and I doubt that the device cited in the link will pass the test either. Bob . . . ________________________________ Message 10 ____________________________________ Time: 04:43:37 PM PST US From: D Wysong Subject: Re: AeroElectric-List: D Sub connector pin out question --> AeroElectric-List message posted by: D Wysong Charlie - The D-Subs in my bin are numbered as follows: -- Pin 1 is at the top left when viewing the D-Sub from the front (looking at the pins or the 'mating side' of the connector). -- Socket 1 is at the top right when viewing the D-Sub from the front (looking into the sockets or the 'mating side' of the connector). If the manual is for a 'black box' they're likely showing you the connector face... so it sounds like they're using D-Sub's with pins (1 at top left) on their hardware. Hope that helps... D Charlie Kuss wrote: > --> AeroElectric-List message posted by: Charlie Kuss > > Bob & Listers, > I'm drawing up several wiring schematics for my RV-8A using AutoCAD. A > number of items in my system use 9, 15 or 25 pin D Subminature connectors. > The manufacturer manuals show that pin number one is on the top (wider) > row, left hand side. My question is: > How is this viewed? Am I looking at the rear of the connector? Which > connector, the male or the female? > Charlie Kuss > > > > > > > ________________________________ Message 11 ____________________________________ Time: 04:49:46 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: How many busses? --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 06:49 AM 6/23/2005 -0700, you wrote: >--> AeroElectric-List message posted by: OldBob Siegfried > > >Good Morning Bob, > >Just a small question concerning proper technical >English. > >I note that Speedy 11 has used the term 'Buss' as in >Buss Bar where you use the term 'Bus' for the same >purpose. > >It is my very shaky recollection that I was taught >many years ago that when referring to an electrical >device, the spelling 'buss' was proper. > >Were we oldsters taught wrong, has the convention >changed, do we remember wrong, or is it of absolutely >no significance whatsoever? > >I did check my dictionary and the only listing it has >for 'buss' is as an old English substitute for a kiss. Yup. At Cessna (1965) and every job I've had since, they are referred to as a "bus". Folks often forget to take the second "s" off when paring down from plural busses to a singular bus. Further, the brand name Bussmann and their foreshortening of the trade name for other marketing names (Buss-Power, has been cited as a strong influence for misspelling the word as well. A Google search on "power distribution buss" yielded 67 hits. A search on "power distribution bus" yielded 1020 hits. Bob . . . >Happy Skies, > >Old Bob >Stearman 3977A > >--- "Robert L. Nuckolls, III" >wrote: > > --> AeroElectric-List message posted by: "Robert L. > > Nuckolls, III" > > > > At 12:47 AM 6/23/2005 -0400, you wrote: > > > > >--> AeroElectric-List message posted by: > > Speedy11@aol.com > > > > > >I'm going to have about six groups of three each > > P&B W-31 switch circuit > > >breakers in my RV-8A. No need to address the fact > > I'm using CBs instead > > >of fuses. > > > I understand those reasons, but I want to use > > CBs. > > >What I need to know is whether or not each group of > > three CBs should be > > >called a buss? Or should I call multiple groups of > > 3 each CBs a > > >buss? Does it > > >really matter? Any problem with having, say, six > > "busses?" > > > > A "bus" is a common feeder for two or more power > > taps. > > It's not uncommon for a breaker panel to have > > multiple > > rows of breakers stacked one above the other with > > a > > single bus conductor that zig-zags down the > > column of > > rows supplying a ONE PIECE means of distributing > > power > > to all of the breakers. The term "bus" is an > > electrical > > term, not a mechanical term. > > > > Bob . . . > > > > > > > > browse > > Subscriptions page, > > FAQ, > > > > > > > > > > > > > > >-- > > >-- incoming mail is certified Virus Free. Bob . . . -------------------------------------------------------- < Throughout history, poverty is the normal condition > < of man. Advances which permit this norm to be > < exceeded -- here and there, now and then -- are the > < work of an extremely small minority, frequently > < despised, often condemned, and almost always opposed > < by all right-thinking people. Whenever this tiny > < minority is kept from creating, or (as sometimes > < happens) is driven out of a society, the people > < then slip back into abject poverty. > < > < This is known as "bad luck". > < -Lazarus Long- > <------------------------------------------------------> http://www.aeroelectric.com ________________________________ Message 12 ____________________________________ Time: 04:57:47 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: D Sub connector pin out question --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 06:20 PM 6/23/2005 -0400, you wrote: >--> AeroElectric-List message posted by: Charlie Kuss > >Bob & Listers, > I'm drawing up several wiring schematics for my RV-8A using AutoCAD. A >number of items in my system use 9, 15 or 25 pin D Subminature connectors. >The manufacturer manuals show that pin number one is on the top (wider) >row, left hand side. My question is: >How is this viewed? Am I looking at the rear of the connector? Which >connector, the male or the female? >Charlie Kuss Looking into the WIRE side of a D-sub MALE (plug) with the wide-side up, pin 1 is in the upper right corner and the highest numbered pin in the plug is in lower left corner. Looking into the WIRE side of a D-sub FEMALE (receptacle) with the wide side up, pin 1 is in the upper left corner and the highest numbered pin in the receptacle is in the lower right corner. I keep a connector laying on my desk that has pin numbers molded into both sides of the insert as a ready reference. It is very easy to get swapped around. Bob . . . ________________________________ Message 13 ____________________________________ Time: 06:50:16 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Aux Batter Management Module --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 01:53 PM 6/22/2005 -0400, you wrote: >--> AeroElectric-List message posted by: "Jim Stone" > >Hi Guys, >I bought the Low Voltage Warning and Auxiliary Battery Management Module >(ABMM) because I have two batteries installed (Odyssey 680s). >After reading the instruction manual it seems I may not need it. >My setup is: Harmon Rocket, 1mag, 1 electronic ignition (electroair), B&C >40 amp alt with voltage regulator and low voltage warning light (LR3c). >I'm thinking that since I don't have a stby alternator or electrically >dependent engine, I probably don't need a unit that is designed to shut >the aux battery down in the event of a primary alternator >failure. Wouldn't it be just fine to continue on to destination or >nearest suitable field as appropriate with both batteries on, while >monitoring my volt meter? if you don't have an electrically dependent engine, why two batteries? Bob . . . ________________________________ Message 14 ____________________________________ Time: 07:33:42 PM PST US From: "Mike & Lee Anne Wiebe" Subject: AeroElectric-List: Help - low voltage --> AeroElectric-List message posted by: "Mike & Lee Anne Wiebe" Well folks, time to draw on the collective wisdom of the masses.again.. Sorry, the info is sketchy so far, but I just got home from the airport and had to vent somewhere. We changed out the battery in our Sequoia Falco, figuring that after three years, the weak starting must be some good old fashioned battery aging. Initial start was very good, with high charging amperage (Bob, further to your conversation with my dad about the battery, I'll confirm that we read alternator amperage, not battery amperage), about 25 amps. The new battery, an Oddessy P680, was stolen from our new project, and was a little run down from various bench activities, so this seems OK. It settled into a steady state draw of about 6 amps, which has always seemed reasonable, given that we have one side electronic ignition, and a full panel of EI electronic instrumentation. After one enroute stop, we started for home near dusk. During operation with strobes, I noticed that the backlights on much of the panel instrumentation was flickering. After a little troubleshooting (I stress little - it was getting dark, and this was an ELECTRICAL problem..so I landed quickly), I know the following: System voltage seemed to vary between 14 and about 11.5, based on load. Worst culprit appeared to be strobes. Even running lights, and two big landing lights didn't cause the same voltage drop as the strobes. So I suspect I'll take the strobes out of the equation just to be sure. But it seems funny to me that with the engine running strong that the voltage would vary very much at all! Through all of this, the amperage draw seemed normal for the given load being called for. Alternator is obviously putting something out, but I wonder about consistency. At one point I turned on a bunch of stuff quickly, just to create load, and the engine monitor reset - something it will do when the starter inrush current draws the system down. I would have thought that turning on a bunch of lights quickly would not have caused that much of an effect, though I've never tried to do that before. System is a B&C 60A alternator and the B&C/Knuckolls Voltage regulator. All my measuring was done on panel instrumentation, which is an Electronics International UBG-16 graphic engine monitor with amperage option. Before shutting down, I advanced the RPM to test for headset whine. There is a slight whine that changes with RPM, but its so very subtle that it may have been there forever and me not notice it. So now I'm going to read my Aeroelectric Connection for more advice. In the meantime, any knowledgeable opinions are appreciated. As is any advice on how to isolate and troubleshoot the problem, since it seems like Saturday is going to be a "fixing, not flying" day, once again. Thx Mike ________________________________ Message 15 ____________________________________ Time: 08:31:51 PM PST US From: Charlie Kuss Subject: Re: AeroElectric-List: D Sub connector pin out question --> AeroElectric-List message posted by: Charlie Kuss > >--> AeroElectric-List message posted by: Charlie Kuss > > > > >Bob & Listers, > > I'm drawing up several wiring schematics for my RV-8A using AutoCAD. A > >number of items in my system use 9, 15 or 25 pin D Subminature connectors. > >The manufacturer manuals show that pin number one is on the top (wider) > >row, left hand side. My question is: > >How is this viewed? Am I looking at the rear of the connector? Which > >connector, the male or the female? > >Charlie Kuss > > > Looking into the WIRE side of a D-sub MALE (plug) with the > wide-side up, pin 1 is in the upper right corner and the > highest numbered pin in the plug is in lower left corner. > > Looking into the WIRE side of a D-sub FEMALE (receptacle) > with the wide side up, pin 1 is in the upper left corner > and the highest numbered pin in the receptacle is in the > lower right corner. > > I keep a connector laying on my desk that has pin numbers > molded into both sides of the insert as a ready reference. > It is very easy to get swapped around. > > Bob . . . My thanks to all who answered my query. Charlie Kuss do not archieve ________________________________ Message 16 ____________________________________ Time: 08:37:13 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Battery charger/desulphator --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 02:22 PM 6/13/2005 -0400, you wrote: >--> AeroElectric-List message posted by: WRBYARS@aol.com > >Greetings, >If anyone is thinking about buying a battery charger/desulphator, such as I >mentioned in my post a couple of days ago, here is a VERY good buy at this >web site. >Bill Byars >1949 T8F > >_http://www.batteryweb.com/batteryminder.cfm_ >(http://www.batteryweb.com/batteryminder.cfm) I have looked at several "desulfators" and own two. I started an article on these devices a couple years ago and tried to find it just now . . . I think it was on a laptop hard drive that crashed some time back. Anyhow, the topic has come up again and I've got some samples coming on yet another approach to the task. I'll see if I can reassemble the earlier data I gathered and combine it with any new discoveries about new hardware after it gets here. Bob . . . ________________________________ Message 17 ____________________________________ Time: 08:56:52 PM PST US From: mprather Subject: Re: AeroElectric-List: Help - low voltage --> AeroElectric-List message posted by: mprather Hi Mike, What RPM (roughly) were you turning when you witnessed the varying bus voltage? The alternator can't keep rated output until it gets to some minimum RPM. Maybe your alternator has a failed diode? I think that may drop its output by about half (25A). I am sure that BandC would be happy to test it for you. It would probably be possible to have it tested at a local automotive store as well. Maybe the sense line to the regulator isn't getting a good solid connection to the bus. Good luck, and let us know what you find. Regards, Matt- VE N34RD, C150 N714BK Mike & Lee Anne Wiebe wrote: >--> AeroElectric-List message posted by: "Mike & Lee Anne Wiebe" > >Well folks, time to draw on the collective wisdom of the masses.again.. > >Sorry, the info is sketchy so far, but I just got home from the airport >and had to vent somewhere. We changed out the battery in our Sequoia >Falco, figuring that after three years, the weak starting must be some >good old fashioned battery aging. Initial start was very good, with >high charging amperage (Bob, further to your conversation with my dad >about the battery, I'll confirm that we read alternator amperage, not >battery amperage), about 25 amps. The new battery, an Oddessy P680, was >stolen from our new project, and was a little run down from various >bench activities, so this seems OK. It settled into a steady state draw >of about 6 amps, which has always seemed reasonable, given that we have >one side electronic ignition, and a full panel of EI electronic >instrumentation. After one enroute stop, we started for home near dusk. > > >During operation with strobes, I noticed that the backlights on much of >the panel instrumentation was flickering. After a little >troubleshooting (I stress little - it was getting dark, and this was an >ELECTRICAL problem..so I landed quickly), I know the following: > >System voltage seemed to vary between 14 and about 11.5, based on load. >Worst culprit appeared to be strobes. Even running lights, and two big >landing lights didn't cause the same voltage drop as the strobes. So I >suspect I'll take the strobes out of the equation just to be sure. But >it seems funny to me that with the engine running strong that the >voltage would vary very much at all! Through all of this, the amperage >draw seemed normal for the given load being called for. Alternator is >obviously putting something out, but I wonder about consistency. At >one point I turned on a bunch of stuff quickly, just to create load, and >the engine monitor reset - something it will do when the starter inrush >current draws the system down. I would have thought that turning on a >bunch of lights quickly would not have caused that much of an effect, >though I've never tried to do that before. > >System is a B&C 60A alternator and the B&C/Knuckolls Voltage regulator. >All my measuring was done on panel instrumentation, which is an >Electronics International UBG-16 graphic engine monitor with amperage >option. Before shutting down, I advanced the RPM to test for headset >whine. There is a slight whine that changes with RPM, but its so very >subtle that it may have been there forever and me not notice it. > >So now I'm going to read my Aeroelectric Connection for more advice. In >the meantime, any knowledgeable opinions are appreciated. As is any >advice on how to isolate and troubleshoot the problem, since it seems >like Saturday is going to be a "fixing, not flying" day, once again. > >Thx >Mike > > > >