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Old 10-29-2019, 07:52 AM   #1
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Output Wiring From Generator - Older Class A

I have a 1985 Holiday Rambler Monitor with an Onan 6.5 generator and am trying to figure out output wiring.

This generator puts out 240V, but only in two 110V legs. There is no (to my knowledge) transfer switch. The wires from the output in the junction box are a red which goes to a black in one piece of wire, a black that goes to a black in another piece of wire and the white which has the output which goes to two other whites.

The one that goes black to black goes back to a 30A, 110V female receptacle. As far as I can tell, one plugs the shore power cord into this outlet to get the output from the generator into the coach.

But, I haven't traced down the leg that is the other 110V. Could that be going to a transfer switch that I haven't found yet? When I am plugged in, everything works but, when I have the generator plugged in there is apparently no connection of the red wire.

Any ideas? Is your coach wired in a similar manner?

Thanks in advance.

Greg Murphy
1985 Holiday Rambler 33' Monitor
Shelbyville, MI
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Old 10-29-2019, 08:42 AM   #2
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The second 120 volt output would be used for a second air conditioner, if installed.

If no second A/C, its not used. The first 120 output is enough to power a 30 amp MH.

If you have 2 A/C's, then there will be a selector switch, whether manual or automatic, that allows front or rear on shore power or both on generator power.

My single air conditioner MH had a 5500 watt generator. It had 2 breakers on it but only one was used.

By the way, I don't think you have 240 volts on that unit. It only outputs 120 volts @ 6500 watts but is split between to breakers.

240 volts has one leg out of phase with the other.
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Old 10-29-2019, 09:25 AM   #3
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Yes, it does have two AC units and a selector switch.

I think I still have a wiring issue somewhere but will have to address that after I get the balky Onan running again!

Thanks for the heads up. I'll need to check the position of that switch.
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Old 11-01-2019, 09:36 PM   #4
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Location: oregon
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Below is a link to smokstack forums and Onans specifically.. that 6.5 you have is hard wired either 110/240 one or the other i am quite sure. To the point post you model and serial number on that site along with any question you may have...There working knowledge is nothing short of amazing.

https://www.smokstak.com/forum/forumdisplay.php?f=1
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Old 11-01-2019, 09:43 PM   #5
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Quote:
Originally Posted by capnm View Post
I have a 1985 Holiday Rambler Monitor with an Onan 6.5 generator and am trying to figure out output wiring.

This generator puts out 240V, but only in two 110V legs. There is no (to my knowledge) transfer switch. The wires from the output in the junction box are a red which goes to a black in one piece of wire, a black that goes to a black in another piece of wire and the white which has the output which goes to two other whites.

The one that goes black to black goes back to a 30A, 110V female receptacle. As far as I can tell, one plugs the shore power cord into this outlet to get the output from the generator into the coach.

But, I haven't traced down the leg that is the other 110V. Could that be going to a transfer switch that I haven't found yet? When I am plugged in, everything works but, when I have the generator plugged in there is apparently no connection of the red wire.

Any ideas? Is your coach wired in a similar manner?

Thanks in advance.

Greg Murphy
1985 Holiday Rambler 33' Monitor
Shelbyville, MI
Your living air conditioner and microwave run off the generator when your plugged into a ac source. There is no manual factory switch...to power the rv with gen power you need to take the shore power cord and plug it into the rv..That port is located in the back of the rv drivers side...on top of the rear bumper you will find an aluminum plate/panel lift that and in the lower outside corner you will see the input for the power cord.
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