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Hi, the house batteries start the generator, the generator itself does not have a charging circuit, when the generator produces ac power it feeds the converter which is the battery charger for the batteries. So locate the converter charger, and test to see if it is working. Test for ac 120 going to it, and see if there is a charge voltage coming off of it, please get back to me for clarification if necessary, and we can discuss this further. Michael
the generator needs the power from the house batteries to keep running. Just like your car engine without its alternator.