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Home » Public Forums » GMCnet » 120Vac Wiring from Onan to Coach, 75' Avion w/ 6k Powerdrawer (Does the LII connect to the chassis?)
Re: [GMCnet] 120Vac Wiring from Onan to Coach, 75' Avion w/ 6k Powerdrawer [message #316578 is a reply to message #316572] Mon, 24 April 2017 21:21 Go to previous messageGo to previous message
A Hamilto is currently offline  A Hamilto   United States
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Registered: April 2011
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k2gkk wrote on Mon, 24 April 2017 20:38
If I'm not mistaken, with the 6 kW Onan power drawer, a single 120 Volt AC output is fed to BOTH the L1 and L2 terminals on the female power socket into which you plug the four-conductor power cable. The L1 and L2 wires of the power cable each feed separate circuit breakers to power 120 Volt circuits in the coach. This arrangement allows you to connect to 50 Amp 240 Volt power pedestals in a campground or a dedicated power 50A/240V circuit at your home! Once again, if memory is working, L1 and L2 wires in the CABLE are Black and Red. The neutral is White, and the safety ground is Green. That should be standard in a GMC coach, but there's no telling what aftermarket finishers did with a Transmode rolling chassis and shell.


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The first half of what you said is correct.

I don't know what was done on all model years, or what Onan did from one year to the next. But my Onan has no color code coming out of the generator section. Mine has two WHITE wires coming from somewhere that are connected together at that "somewhere" and another WHITE larger gauge coming from somewhere else. Some drawings seem to show the two wires as L1 and the single as L2, other drawings show the single wire as L1 and the two wires as L2. Mine has the two wires connected together again to one, and the single split to two (?).

There is no black and red and white and green coming off the Onan itself. Those colors come out of the splice box in the generator compartment (or wherever it is). Those colored wires go to the 50A Onan receptacle or whatever changeover rigging is installed to go from shore to generator and vice versa.

I ohmed out the white wires coming from the Onan, and the one(s) that are a dead short to the Onan case got connected to BOTH the green wire and the white wire in the splice box. Whatever was left (probably comes from the circuit breaker) got connected to BOTH the black wire and the red wire. Those wires go from the splice box to the 50A Onan outlet in the electrical/city water compartment. The 50A receptacle is wired like you would expect, a black to one hot, a red to the other, the white to neutral and green to ground.

That is electrically equivalent to the setup where the output of the splice box through the flexible conduit is one no. 6 white wire to the ground AND JUMPERED TO THE neutral wire (or vice versa) on the 50A outlet and one no. 6 black wire that goes to one of the hot connections and is jumpered to the other hot on the 50A receptacle.

Others have different setups for switching between shore power and Onan, but I am thinking the Onans are the same from 1973 to 1978.

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