Actually, my coach charges the house batteries from the engine battery. Whether or not this is unique to Class C coaches I don't know. But there is an Intellitec Isolator Relay Delay/E auto switch installed that accomplishes this.
http://www.intellitec.com/assets/pdf...-00629-120.pdf
One way to tell for sure is if you are comfortable with a voltmeter, to put the voltmeter on your coach batteries. Then start the engine. After about 5~10 seconds, you should see a very slight increase in voltage - it's almost not noticeable, and only around 1Volt.
The increase in voltage is the charge voltage from the engine's alternator. The delay is so that the engine can briefly warm up before starting to charge the coach batteries.
If your coach exhibits the voltage increase as described above, then the alternator is likely charging your coach batteries.
If you find that is the case, run the test again with the kill switch off, and see if there is the telltale increase in voltage about 5~10 seconds after engine start.
Thor Forums
