Onan 5500 keeps stopping

[doit999]

Went to the trailer today and fired up the genny and put it under load by running both a/c, ran good for a while and then the breaker on the genny tripped and shut it all down. I can fire it up ok but after about 1 min it shuts down, as soon as it seem to convert. I can hear a click and then she shuts down. I believe the code is 12 which shows as a over voltage fault. Any ideas would be appreciated! Can it handle both a/c's?? Thanks


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