bobwalter wrote:
The generator normally starts from the coach batteries. The voltage of the coach batteries measured at the solenoid is 13.57 volts on both sides of the solenoid.
A voltage of 13.57 volts is NOT the battery's voltage. It is the converter/charger's voltage. The converter/charger does not have enough amps to turn the starter. I still think you have a dead battery, and the converter charger can't provide the power without the battery online.
You may save yourself some money by taking the battery out and carrying it to a big box auto parts store for a load test.