---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 07/07/21: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:10 AM - Buy New Apple iPhone 12 Pro 5G 128GB Original Unlocked $849 (jeiaery) 2. 06:53 AM - Re: Melted battery contractor ground wire (nuckollsr) 3. 04:09 PM - Re: Melted battery contractor ground wire (frank3) 4. 04:47 PM - Re: Re: Melted battery contractor ground wire (Charlie England) 5. 05:31 PM - Re: Melted battery contractor ground wire (user9253) 6. 06:25 PM - Re: Re: Melted battery contractor ground wire (Robert L. Nuckolls, III) 7. 07:31 PM - Buy New Apple iPhone 12 Pro 5G 256GB Original Unlocked $949 (jeiaery) ________________________________ Message 1 _____________________________________ Time: 04:10:59 AM PST US Subject: AeroElectric-List: Buy New Apple iPhone 12 Pro 5G 128GB Original Unlocked $849 From: "jeiaery" The Price is Canadian dollar. Visit Our Website www.esellibuy.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502735#502735 ________________________________ Message 2 _____________________________________ Time: 06:53:29 AM PST US Subject: AeroElectric-List: Re: Melted battery contractor ground wire From: "nuckollsr" At 09:08 PM 7/6/2021, you wrote: Frank, The only way you are going to melt that wire is likely with a direct short between positive and negative battery voltages. Most likely candidates forthat occurrence is a mis-wired switch or contactor. Question: did this contactor installation EVER work? Q: What is the measured resistance of the contactor's coil? . . . WITH ANY SPIKE SUPPRESSION DIODE REMOVED. Q: Is there ANY continuity between the any terminal of contactor and it's case? Q: What kind of contactor is this? 3-terminal, 4-terminal? Q: Is there a spike suppression diode installed across the contactor's coil terminals. Has this been checked for proper polarity? (Banded end needs to fact the battery, other end faces master switch). If this diode is BACKWARDS or SHORTED it will cause failure of the contactor-to-master switch wire. If a backwards diode is found to be root cause of the burned wire, then replace BOTH diode and wire. The current impressed on the diode during wire-burning will have exceeded its ratings and it's probably toast too. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502737#502737 ________________________________ Message 3 _____________________________________ Time: 04:09:48 PM PST US Subject: AeroElectric-List: Re: Melted battery contractor ground wire From: "frank3" Folks, I posted some erroneous info. When I measured the resistance between the small contactor terminal and the larger terminal connecting to the battery (+) I did so with the diode in place. Hence, the "no resistance". (I'm still learning or at least trying to) Today I removed the contactor, removed the diode from the contactor, and checked for resistance, again. This time I got 0.016 ohms. So, according to Joe's criteria, it's still a bad contactor. Guess we ended up at the same place using a different path? Just for kicks, I did a bench test. I connected a 22 awg wire to the small terminal, terminating at the the master switch (2-10). Using a similar wire I connected to the switch terminating at neg side of contactor. I applied jumper cables to the large contactor terminals. I activated the switch and then connected the jumper cables to the battery. Same result--wires melted. Tried to attach pic of the contactor on the firewall but unable to reduce the pic file size. Joe asked what size wire I used. 18 awg contactor to master switch; 22 awg to field of tabs. I can not recall whay I used the 18 awg instead of 22 awg. The 18 awg survived the event. The 22 awg melted, as a fussible link for the 18 awg? Bob, if you still want the contactor I'll gladly send it to you. Just let me know where to send. Thanks everyone for you interest and advice. I have ordered a new contactor from our friends at B&C. -------- Frank McDonald Kitfox S7 - sold RV7 in progress Acworth, GA Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502739#502739 ________________________________ Message 4 _____________________________________ Time: 04:47:52 PM PST US Subject: Re: AeroElectric-List: Re: Melted battery contractor ground wire From: Charlie England On 7/7/2021 6:09 PM, frank3 wrote: > > Folks, I posted some erroneous info. When I measured the resistance between the small contactor terminal and the larger terminal connecting to the battery (+) I did so with the diode in place. Hence, the "no resistance". (I'm still learning or at least trying to) > > Today I removed the contactor, removed the diode from the contactor, and checked for resistance, again. This time I got 0.016 ohms. So, according to Joe's criteria, it's still a bad contactor. Guess we ended up at the same place using a different path? > > Just for kicks, I did a bench test. I connected a 22 awg wire to the small terminal, terminating at the the master switch (2-10). Using a similar wire I connected to the switch terminating at neg side of contactor. I applied jumper cables to the large contactor terminals. I activated the switch and then connected the jumper cables to the battery. Same result--wires melted. > > Tried to attach pic of the contactor on the firewall but unable to reduce the pic file size. > > Joe asked what size wire I used. 18 awg contactor to master switch; 22 awg to field of tabs. I can not recall whay I used the 18 awg instead of 22 awg. The 18 awg survived the event. The 22 awg melted, as a fussible link for the 18 awg? > > Bob, if you still want the contactor I'll gladly send it to you. Just let me know where to send. > > Thanks everyone for you interest and advice. I have ordered a new contactor from our friends at B&C. > > -------- > Frank McDonald > Kitfox S7 - sold > RV7 in progress > Acworth, GA That doesn't 'sound' right. There should be 2 'fat' terminals and one small terminal on a typical master contactor. With no voltage applied, you should measure open circuit (infinite resistance) between the small terminal and one of the fat terminals, some relatively low (but not close to zero; see Joe's resistance number) resistance between the small terminal and the other fat terminal, and infinite resistance between the 2 fat terminals. Measuring .016 ohms with a typical ohm meter sounds a little suspicious; there's often more resistance than that in the leads and terminal contact points. Did you have it hooked up as shown in this video? https://www.youtube.com/watch?v=7FSK1JblQaE Near the end, he shows how to hook up a 4 terminal version (less common). Charlie -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 5 _____________________________________ Time: 05:31:11 PM PST US Subject: AeroElectric-List: Re: Melted battery contractor ground wire From: "user9253" Frank, I interpreted your post to mean that you connected one jumper cable from battery positive to a fat terminal on the contactor, and you connected another jumper cable from the negative battery terminal to the other contactor fat terminal. If that is true, then you are lucky that the contactor is defective. There could have been flying molten metal. The negative battery terminal should NOT be connected to a fat contactor terminal because something bad will happen. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502741#502741 ________________________________ Message 6 _____________________________________ Time: 06:25:55 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Melted battery contractor ground wire > >Bob, if you still want the contactor I'll gladly send it to >you. Just let me know where to send. Bob Nuckolls PO Box 130 Medicine Lodge, Kansas 67104-0130 >Thanks everyone for you interest and advice. I have ordered a new >contactor from our friends at B&C. Was this contactor from B&C originally? Which part? Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ________________________________ Message 7 _____________________________________ Time: 07:31:57 PM PST US Subject: AeroElectric-List: Buy New Apple iPhone 12 Pro 5G 256GB Original Unlocked $949 From: "jeiaery" The Price is Canadian dollar. 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