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Old 08-22-2005, 11:59 AM   #1
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Problem running both roof AC units

In the past I have been able to run both roof AC units on my Land Yacht motorhome when I was running the generator. On the recent trip I was able to only run one unit when the generator was running and that was the unit that was selected by the switch for use when on "shore" power. The monitor station showed that the generator was running. The generator is operating just fine.

Does any one know what might be the problem?

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Old 08-22-2005, 12:04 PM   #2
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Not a expert on this subject, but have you verified the amps/volts coming out of the generator?

Additionally, is the generator large enough to power both units or were you just running them? It could be that they were running, but due to low voltages/amps, you could have damaged the compressor(s) to the point that they now require more juice to start up.

Just a few thoughts....

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Old 08-22-2005, 12:28 PM   #3
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2nd AC

Originally Posted by BW_LandYacht36MH
Does any one know what might be the problem?
On the earlier MoHo's with twin ceiling AC's the genny output was split with 2 AC circuits - one for the "main" selector switch and the other dedicated to the rear AC only....

I would first check the output at the generator of the secondary leg and proceed from there - no voltage at the output of the generator it is a generator related problem (there should be a circuit breaker mounted on the generator for both the main and secondary circuit). If you have voltage at the circuit breaker of the secondary circuit at the generator, trace out the output from the secondary generator circuit to the AC - there should be an "isolator switch" that allows the rear AC to operate independant of the "main" switch.
You should be able to follow the circuit with the electrical diagram suppllied in your owners manual.

On the "Classics" the "isolator" switch is mounted on the cabin side of he generator housing.

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Old 08-22-2005, 06:55 PM   #4
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Thanks for the info about the two circuits out of the generator, my problem was that something had tripped the circuit breaker for the rear AC unit. Problem solved.

Thanks for the info.
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