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Paul Valovich
Joined: 11 Jan 2006
Posts: 75
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 Posted: Mon Jun 14, 2010 6:33 pm Post subject: Reverse Current - Life Is Indeed Harder When You're Stupid |
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The dumbest thing I’ve done on my RV-8A project – I reversed the battery connections when reassembling after firewall forward work and planning a final elec check before riveting on the top skin. Z-13/8; Smoke and fire from the diode wire to the main terminal of the battery contactor; corrected polarity and tried a jumper wire – more smoke and fire when I go to Batt/Alt – making me think there is something wrong further downstream.
Ordered a replacement contactor from B&C (this time a -2; previous was a -1) but have been on business travel and have not had a chance to troubleshoot.
Jumping the contactor and switching to Batt seems to have all the trons flowing to their proper destination; going to Batt/Alt causes everything to shut down.
Any words of wisdom from the forum. Don’t bother reminding me what a DS move it was – I already know and still can’t believe I did it.
Paul Valovich
N192NM Reserved
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user9253
Joined: 28 Mar 2008
Posts: 1931
Location: Riley TWP Michigan
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| Posted: Tue Jun 15, 2010 4:00 am Post subject: Re: Reverse Current - Life Is Indeed Harder When You're Stup |
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Reverse polarity will not affect a contactor coil but will damage a diode connected across the contactor coil. Assuming that the main contactor pulled in despite the shorted diode in parallel with it, then the starter contactor diode and alternator rectifying diodes were also shorted out and damaged along with any other polarity sensitive devices that were turned on.
Joe
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Joe Gores |
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jfogarty(at)tds.net
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| Posted: Tue Jun 15, 2010 6:49 am Post subject: Reverse Current - Life Is Indeed Harder When You're Stupid |
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Change out the battery and see if that works, you may have reversed the battery polarity in your battery. I'm sure there will be many other ideas. Just make sure the polarity in the battery is correct.
Jim
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