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04-17-2018, 04:27 PM
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#1
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Senior Member
Join Date: Mar 2005
Posts: 156
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AC Not working on generator
Hello
My rig has two roof AC units. I've found that the main one does not work when running the generator, but it does work fine on shore powere. Even if I try only the main unit it won't work when getting power from the generator. Any ideas?
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Steve & Dora
2005 Fleetwood Terra 32s
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04-17-2018, 04:31 PM
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#2
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Registered User
Join Date: Aug 2014
Location: western NC mountains!
Posts: 4,106
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is your generator breaker tripped?
try resetting it anyway, as it probably also has another breaker hidden behind the generator cover, and may be the 'side' of the power that your Main ac unit operates with.
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04-17-2018, 06:01 PM
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#3
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Senior Member
Join Date: Mar 2005
Posts: 156
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The generator is producing power. I can run the 2nd AC while on the generator no problem, just the first unit
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Steve & Dora
2005 Fleetwood Terra 32s
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04-17-2018, 06:06 PM
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#4
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Senior Member
Join Date: Jun 2017
Posts: 2,807
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Quote:
Originally Posted by Steve&Dora
The generator is producing power. I can run the 2nd AC while on the generator no problem, just the first unit
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It's producing some power on 1 leg, probably not the other leg.
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04-17-2018, 07:32 PM
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#5
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Senior Member
Join Date: Jan 2013
Location: Muskoka Ontario Canada
Posts: 3,142
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If it is an Onan generator, there are two breaker switches on the side of the genny. If one is tripped, you would probably lose one air unit. Shut both off, and reset them. You didnt state what kind of genny you have.
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 2000 coachmen santara 370 5.9 cummins isb
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04-17-2018, 07:48 PM
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#6
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Senior Member
Join Date: Mar 2005
Posts: 156
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Ok let me check the breakers, it is I believe an on an generator
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04-17-2018, 07:56 PM
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#7
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Senior Member
Monaco Owners Club Grand Design Owners Club
Join Date: Aug 2016
Posts: 250
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In some cases Fleetwood used a selector switch in cases when the generator was not big enough to power both units. Inside of a cabinet, usually forward and driver's side there is a two or three position switch that says "A" or "B", I think I had an "off" option in the middle. So when plugged in, no problem, they both worked, when on generator I had to choose the front or rear AC unit. I have since sold my Fleetwood or I would take a picture. As others have said, it could be one of your two breakers is tripped.
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2002 Monaco Executive
Cummins 500ISM (11L)
Castle Rock, CO
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04-17-2018, 08:49 PM
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#8
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Senior Member
Join Date: Mar 2005
Posts: 156
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This one handles it by cycling the power automatically when needed. But the fans keep running
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04-21-2018, 01:17 PM
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#9
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Senior Member
Join Date: Mar 2005
Posts: 156
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I played with again today. It is a onan marques generator. Has two circuit breaker on it a 20amp and a 30 amp. I reset both of them and still didn't work. I did find that if I have the fan turned on when starting the generator it runs for about 15-30 seconds, then stops.
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Steve & Dora
2005 Fleetwood Terra 32s
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05-19-2018, 11:03 PM
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#10
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Senior Member
Join Date: Mar 2005
Posts: 156
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Fixed
Well found out what was wrong. Turns out that the 20 amp breaker needs to be off. I ended up taking it to Camping World. With only the 30amp breaker on, everything works fine. When both are on is when I can't run the 1st AC unit. The 20amp breaker on the generator was for if they had wired the 2 ac units differently. More then likely it had always been off, but when we blew teh circuit on the generator and I flipped them both on is when the problem started.
Doesn't make sense to me honestly, but with only one breaker on it works, so that will work for me
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Steve & Dora
2005 Fleetwood Terra 32s
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05-21-2018, 05:21 AM
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#11
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Community Moderator
Monaco Owners Club
Join Date: Jul 2016
Location: Central, Arkansas
Posts: 11,286
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So basically then when the generator thinks you are using the 20 amp side it only delivers power to one leg. 30 amp only, it delivers it to both legs. It automatically defaults to the lower setting when both are on.
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2004 Beaver Monterey Laguna IV
Cummins ISC 350HP Allison 3000 6 speed
2020 Chevy Equinox Premier 2.0t 9 speed AWD
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05-21-2018, 12:26 PM
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#12
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Sounds to me like the 20 amp breaker is installed the wrong way.. I mean I've never heard of it but in theory it can happen.
EIther that or another major screw up in the wiring. CW is not the best electrical dotor.
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