| Coachman 12V RV Wiring Route [message #363749] |
Fri, 30 April 2021 07:58  |
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JBO
Messages: 65
Registered: August 2012
Location: South Western Ontario
Karma: 0
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Howdy Folks,
Does anyone have knowledge on the routing of the 12V RV wiring for a 1978 Coachman Center Kitchen? I have developed a ground fault issue with the 12V house lighting on the right side. When I go back to the fuse panel at the back it would appear the wiring exits the fuse panel and goes down towards the left side. I have a few things in the way of seeing where the wiring heads after it goes left. Somewhere the wiring must make it's way up and over to the right but where?
Any help on that issue as well as any pointers on trying to locate the ground fault would be greatly appreciated. The fuse blow instantly.
Thanks, Jim
Jim Owens,
78 Royale,
Out skirts of Kitchener, Ontario
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| Re: Coachman 12V RV Wiring Route [message #363750 is a reply to message #363749] |
Fri, 30 April 2021 08:53  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Have you tried disconnecting it at the first fixture in the chain on that side? If fuse does not blow the problem is after or at that first fixture. Then you can search in the correct zip code. Coachmen were not as “by the book” aa GM upfits is what I hear, so schematics may be close but not.exact as to wire colors etc.
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Fri, 30 April 2021 08:55] Report message to a moderator |
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| [GMCnet] Re: Coachman 12V RV Wiring Route [message #363754 is a reply to message #363751] |
Fri, 30 April 2021 11:44 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Do you still have the original glass fuse house panel? If so I would remove
it from its mounts and start there. Maybe the wire has heated up and shed
insulation.
Have you done ANY work on the interior between when the lights worked
correctly and now? I once had a short to ground caused by nicking a wire
with an interior trim screw.
Sully
Bellevue wa
On Fri, Apr 30, 2021 at 7:59 AM Jim wrote:
> I disconnected the rear lamp as I assumed it would be the first in line.
> Noticed the wires going to the lamp were coming from the front of the
> cabinet. So I then disconnected the light in the center of the coach in
> the kitchen area as perhaps this may be the first in the series depending on
> where the wires come from. Fuse still blows with both fixtures out of the
> loop. I have a wire grounding out to the body somewhere...fun and games....
> --
> Jim Owens,
>
> 78 Royale,
>
> Out skirts of Kitchener, Ontario
> _______________________________________________
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| [GMCnet] Re: Coachman 12V RV Wiring Route [message #363758 is a reply to message #363757] |
Fri, 30 April 2021 14:46 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Take the screws back out that you added and try the fuse again.
Sully
Bellevue wa
On Fri, Apr 30, 2021 at 12:21 PM Jim wrote:
> It does have the original glass fuses in the back.
>
> I have not done any interior work, I have been working on the body though
> and I relocated the right rear outside clearance light to accommodate the
> new awning I have on order. I had to tug on the wires a bit and if the
> Coachman wiring was routed up by the OE GM wiring than I guess it's
> possible I
> pulled something loose from the Coachman wiring. It definitely is a big
> mystery why all of a sudden I have the issue.
>
>
> --
> Jim Owens,
>
> 78 Royale,
>
> Out skirts of Kitchener, Ontario
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Coachman 12V RV Wiring Route [message #363764 is a reply to message #363749] |
Sat, 01 May 2021 06:35 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Jim,
What are the chances of pulling a new wire from the center kitchen light over to the entrance way light switch? If that is possible, then you could cut off the existing shorted wire and label it "shorted" if it won't come out.
If that is not possible, then back off the pod screws on the right side of the coach near the center kitchen light area. If that fixes the short, see if you can move the wire a bit to get it away from the screw. You could then add a couple of washers under the screws you loosened. Then I would add a fuse in the line over to the switch and put the smallest amp fuse that would operate the entrance way light. That way if the short happens again, minimum short circuit current will blow that fuse.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| Re: Coachman 12V RV Wiring Route [message #363765 is a reply to message #363764] |
Sat, 01 May 2021 07:38 |
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JBO
Messages: 65
Registered: August 2012
Location: South Western Ontario
Karma: 0
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Bruce,
Thanks for the great suggestions. Chances are I will not be able to run a new wire with out ripping half the motorhome apart. I will look into the other suggested options at this time. The headliner does need to be addressed but that's a project for another winter. So may even have a temporary solution in place till then.
I will be calling on you at some point to discuss the best way to isolate my two Coachmen batteries(generator and house) again soon, I know you gave me some input before but apparently I've forgotten!
Jim Owens,
78 Royale,
Out skirts of Kitchener, Ontario
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