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Old 08-28-2021, 06:09 PM   #1
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Generator Runs, No 120 Volts

I have a 12500 Onan generator in my rig. Generator runs great, but no 120 volts to refrigerator, microwave, receptacles, etc. I checked the generator side of the transfer switch and no voltage. Checked the circuit breaker switch at generator and it was on. Is there any thing between generator circuit breaker and transfer switch. Should I suspect the circuit breaker switch?
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Old 08-28-2021, 06:28 PM   #2
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I'm not a Newmar owner but I would think it highly unlikely that there's anything between the generator circuit breaker and the transfer switch. Just to be sure you can check the continuity between the transfer switch and the circuit breaker with a multimeter (with the generator off).

Circuit breakers can and do fail. Someone with knowledge specific to your generator will have to chime in to advise you on access and testing.
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Old 08-28-2021, 06:33 PM   #3
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check the circuit breaker(s) ON the genny. even if they appear to not be tripped reset them anyway.
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Old 08-28-2021, 06:42 PM   #4
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I don't know about the 12,500 on a 8000 has a inspection cover on the top front of the generator and under that cover is where the gen. wires and coach wires are join together in a junction block. I seen the set screws come loose or strip out. Good Luck
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Old 08-28-2021, 11:13 PM   #5
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Cruddy slip rings and brushes will cause that. Go to a Cummins/Onan shop. If you're lucky it won't be the voltage regulator.
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