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wonder where my NEG went [message #363261]

Tue, 06 April 2021 08:23

LNelson

Messages: 335
Registered: December 2008
Location: Springfield, MO

Karma: 0

Senior Member

Wife and I left Lower MO on Easter Sunday for a "pretend we're retired" trip to New Orleans and then to Gulf State Park, all in a week. Stayed at Canton, MS for a quick overnight but now at Pontchartrain Landing in N.O. a place we have stayed at many times. Anyway, on our trip down, our bathroom, hallway, and overbed lights all went dark. We survived the first night. Yesterday on our arrival at N.O. I wanted to see if I had a hot wire at the hall light. Using a "for sure" negative at the converter, I confirmed I had a hot wire at the fixture. So I cobbled a small test lead toe gruond and got all three sets of lights working. I was sure it was a ground thing and now I know. I ran a ground over to the adjacent ceiling AC receptacle and all is good, but I would like to find where the neg (ground) wire might be attached to ground when I get back so I can properly repair this. Yes, I should look at the wiring diagram but that is "schematic" and I know someone can rattle this off the top of their head....and besides I am pretending to be retired. Thanks in advance.

Larry Nelson Springfield, MO Ex GMC'er, then GM Busnut now '77 Eleganza ARS WB0JOT

[Updated on: Tue, 06 April 2021 08:26]

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Re: wonder where my NEG went [message #363262 is a reply to message #363261]

Tue, 06 April 2021 08:57

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Larry,

I am afraid that the published schematics will not be a lot of help except to confirm that the bath, hall and a reading light all share a common ground connection. It gives no hint where that is actually located.

Maybe some one of the people that have completely gutted a coach can tell us where to look. But maybe not too.....

When/if you do locate that ground, please tell us where it is.

I know what I would do. I would find a convenient roof frame and make a new ground to the hall way light. That should pick up everybody else.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: wonder where my NEG went [message #363319 is a reply to message #363261]

Wed, 07 April 2021 19:18

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

If all of those negatives are still hooked together then any one connetion to the aluminum body frame, as Matt suggests, makes sense. If it is just one ground lead for one light you can also do the same thing. Most accessories inside the coach are just connected to a convenient aluminum piece somewhere on the body of a GM fitted coach. You night want to stick a star (tooth) washer between the aluminum frame and the ground wire lug. The aluminum body is the master ground for all 12 DC things in the house portion of the coach. I can not comment on other upfitted coaches.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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