| [GMCnet] New owner needs electrical help/gfi snaps + torque for 455 head bolts [message #94680] |
Thu, 05 August 2010 05:17  |
David L Greenberg
Messages: 899
Registered: January 2004
Location: Port St Lucie, FL
Karma: 0
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On Thu, 5 Aug 2010 01:36:34 -0400 Mary Duprey <marysgmcplace@hotmail.com>
writes:
>
> Just wondering if anyone can give me some info on the electrical
> system of the 76 GMC Palm Beach? Try to plug unit in for power and
> gfi snaps every time in garage, yet everything runs when generator
> is on. Owners manual says electrical plug needs to be plugged into
> box in order to run coach on generator but box is locked and seems
> to be direct wired. Any suggestions, could be power cord, but looks
> fine, has different plugin on end with adapter to plug into a
> regular 3 prong plug.
>
Roland, it is likely prior owner Don Wirth might have changed the 50A
cord to a 30A, in order to get more cord stuffed in the stowage area.
Many
owners have made this change. You might call Barbar Wirth who still lives
in Harteville OH to see if she knows anything about it.
(330) 877-3306
Also, if you don't have an owner's manual check Billy Massey's GMC
Publications web site for one. http://www.bdub.net/manuals/index.html You
may have to use
the 1977 manual.
David Lee Greenberg
Port St Lucie, FL skype: david.lee.greenberg
Dedicated to the Preservation of the Classic GMC Motorhome
http://GMCmhRegistry.com
http://www.picturetrail.com/gmcregistry
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Dave Greenberg
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davegreenberg1@juno.com
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| Re: [GMCnet] New owner needs electrical help/gfi snaps + torque for 455 head bolts [message #94813 is a reply to message #94680] |
Fri, 06 August 2010 05:03  |
Larry C
Messages: 1168
Registered: July 2004
Location: NE Illinois by the Illino...
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Senior Member |
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Try to plug unit in for power and
> gfi snaps every time in garage, yet everything runs when generator
> is on
______________________________________________________
The GFI is telling you there is a problem or its electronic circuitry is telling it there is a problem.
One cause may be a weak GFI but I usually see them either work or not.
Try opening all your circuits in the GMC then try pluggin in. Dont forget the Buzz Box.
if it trips there is a problem with ground, neutral or Line.
If the ground and neutral are connected to gether inside the GMC, that will trip it.
if you are using the 50 amp cord, use a meter on resistance and go across the line to neutral, neutral to ground, and ground to line. do this to both line spades. They should all read zero.
if you get a reading, you may need to disconnect the wiring to the coach, opening the cb's should be good enough to get the desired test result. If you have a genset throwover, the problem can be in there. People tend to tie the neutral and grounds which are supposed to separate when on shore power.
Your end result you want is zero readings across all spades on the cord plug.
LarC ( Always careful with those GFI protectors, sometimes they are real finicky )
Gatsbys' CRUISER  08-18-04
74 GLACIER X, 260/455-APC-4 Bagg'r
Remflex Manifold gaskets
CampGrounds needed, Add yours to "PLACES" />
http://www.gmceast.com/travel
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