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Old 06-04-2015, 11:35 PM   #1
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Some AC items not working with generator

On my 2013 Coachman Mirada 35DS, I suddenly can't get some equipment to work on AC when running off the generator. These are the Ref. on AC (goes to gas on auto), front A/C, TV and coach battery charger. On shore power all is well. Microwave and rear A/C unit work on generator. I checked all the breakers in the distribution panel, and both breakers on the generator (Onan 5.5kw), and nothing seems wrong. Anyone have ideas on where to look next?
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Old 06-05-2015, 12:17 PM   #2
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Another piece of info. The coach has a manual crossover for power, by moving the 50 amp cable from shore to an outlet in the power compartment, that is a feed from the generator. with the gen running, there is full voltage on both legs.
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Old 06-05-2015, 12:33 PM   #3
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Hmmmm....is it possible that only one of the breakers on the Benny has tripped?

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Old 06-05-2015, 12:34 PM   #4
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Quote:
Originally Posted by mzbrandi View Post
Hmmmm....is it possible that only one of the breakers on the Benny has tripped?

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Danged auto correct.....I meant to say genny not Benny.

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Old 06-05-2015, 02:07 PM   #5
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My second post was probably not clear. When I have the gen. on, the outlet that I would plug the power cable into is hot on both legs, so the generator seems to be ok, at least as far as voltage is concerned. I can't figure out where the difference is, since both the gen. and shore feed are common at that point (the cable end).
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Old 06-05-2015, 02:39 PM   #6
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You should be reading these voltages at your receptacle in the coach if all is good. Is that what you get?
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Old 06-05-2015, 03:07 PM   #7
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Thanks, Fonzie. I get all the correct readings, except for the 240 across the hot legs (0). I would not be surprised if this is correct for a generator, but can't be sure.
My assumption was that if the gen output was correct, then it should make no difference what the cable's source is. Is there something downstream that knows the difference and has reacted to it?
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Old 06-05-2015, 03:39 PM   #8
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If your generator is similar to the one in this link, then the voltage you are seeing at the receptacle is correct. There could be a control module downstream that is not functioning properly and you are only getting one leg of the supply working. I am not familiar with your RV type to troubleshoot any further as this moment.

Cummins Onan RV QG 5500 LP - 5.5kW RV Generator LP
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2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
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Old 06-05-2015, 03:44 PM   #9
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yes, that is exactly it.
One leg of power is not working.

Check your circuit breakers.
Check output on both generator legs to ground. Each should have 120 volts.
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Old 06-05-2015, 06:37 PM   #10
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All breakers good. 120v AC on both legs from generator to ground. I just wonder if it's possible to have voltage on one leg, but no or miniscule current, and how to test for this.
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