Is the Coach 12v disconnect switch in the ON position? I realize you stated that if you run the generator and the engine it appears to be OK for 5-6 hours. If this is really true, then you need to verify that all of the 12v and AC circuit breakers are not tripped. Don't trust the apparent position of the breakers. Actually trip the breaker and then place it back in the ON position. Also check the lights n the converter and the fuses. Again if you have IDIOT lights on the fuses DON'T trust them, that's why we call them IDIOT lights. They don't always light when blown.
