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| Re: First Post - Wiring 78 Royals Neutral Ground short trips GFI [message #324325 is a reply to message #323103] |
Sun, 24 September 2017 21:18   |
Scott Nutter
Messages: 781
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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And once again, mine is exactly like "thesmith's" either plug the 50 amp cord into the APU female receptacle or shore power.
I have no idea if this was stock or a PO upgrade. But with a 3 prong 110 AC adapter and cord it still blows GFI's.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: [GMCnet] First Post - Wiring 78 Royals Neutral Ground short trips GFI [message #324326 is a reply to message #324325] |
Sun, 24 September 2017 21:56 |
dan molnes
Messages: 166
Registered: October 2011
Karma: 1
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So does mine I think it's a problem with an open ground or neutral wire I just plug it into a regular outlet
Sent from my iPad
> On Sep 24, 2017, at 7:18 PM, Scott Nutter wrote:
>
> And once again, mine is exactly like "thesmith's" either plug the 50 amp cord into the APU female receptacle or shore power.
> I have no idea if this was stock or a PO upgrade. But with a 3 prong 110 AC adapter and cord it still blows GFI's.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
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| Re: First Post - Wiring 78 Royals Neutral Ground short trips GFI [message #324337 is a reply to message #324325] |
Mon, 25 September 2017 08:50 |
Aaron
Messages: 21
Registered: February 2017
Location: Oklahoma
Karma: 0
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Junior Member |
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Scott,
In that case, you just have to get methodical and run it down. It should be one of 3 things
1) ground and neutral wires connected to the same bus in the breaker box
2) incorrect wiring on one or more circuits that shorts the ground and neutral wire
3) a bad spot in the wiring where insulation has become exposed and the neutral wire is ground to the frame
There is a short write up in GMC Motorhome information, under "chassis electrical" "GFI testing."
http://gmcmotorhome.info/chassis.html#GFI
If you're familiar with using a multimeter to test for resistance and some basic wiring, than it's not too hard, if not, a good electrician should be able to run through the process quickly, and correct the *common* problems almost as quickly.
Scott Nutter wrote on Sun, 24 September 2017 21:18And once again, mine is exactly like "thesmith's" either plug the 50 amp cord into the APU female receptacle or shore power.
I have no idea if this was stock or a PO upgrade. But with a 3 prong 110 AC adapter and cord it still blows GFI's.
78 Royale, rear dinette
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| Re: First Post - Wiring 78 Royals Neutral Ground short trips GFI [message #324372 is a reply to message #323103] |
Tue, 26 September 2017 00:19 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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When I first tried to plug mine into correctly wired 220V socket it produced very loud hum from the "buzzbox" converter, loud enough to hear outside and make me unplug it immediately. After much testing and tracing and disassembling, I found the white wire on the water heater also had the ground attached there by the crew that replaced it in the GMC's previous life. Fortunately, it was a good learning experience in 1973 GMC ac wiring and that knowledge has prevented me from creating certain circuits that would conflict with the generator wiring.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: First Post - Wiring 78 Royals Neutral Ground short trips GFI [message #324386 is a reply to message #323103] |
Tue, 26 September 2017 08:48 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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My 23' had a Junkerac genset and a wall - type switch to change from shore to genset. When it failed, I put a 50 Amp relay in which the genset pulled to go to generator power. The 26' is GMC all the way through. I've seen no need to change it to a transfer switch, the genset plug is where I store the shore power cable plug anyway.
--jophnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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