| [GMCnet] Found my electrical gremlin [message #303624] |
Fri, 15 July 2016 09:54  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
|
Senior Member |
|
|
As I posted earlier, a few weeks into this Alaska trip we started have an issue with the chassis battery unexpectedly running down over night while dry camping. Never happened before. We also had strange behavior with some of the house 12vdc appliances and there also was a 12.x voltage showing between the chassis negative cable and negative post. I could not find an explanation for all of these symptoms so did a quick rewiring of a couple of the appliances to provide known 12vdc from the house battery and good grounds for each. We also stopped dry camping and as long as we were plugged into shore power never had the chassis battery run down again. But I never could find any root cause for these strange behaviors.
Today I took everything out of the coach to do a deep cleaning. In the rear, under a platform beneath the center section of the rear U shaped lounge I found four ground wires had come loose from a master ground back to the aluminum body structure. Apparently without those grounds the circuits they were supposed to ground found an alternate path to ground that somehow involved the negative on the chassis battery. While I can’t explain the why, fixing those grounds did appear to eliminate the 12.x volt drain between the chassis battery and the chassis negative cable (measured drain now is 0.16vdc) and the temporarily rewired appliances now work properly again with the original wiring. Strange. Never take anything for granted when it comes to grounds I guess is the lesson.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
