Quote:
With the engine running the coach lights will flicker bright and dim like the charging pulsates.
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With two 6 volt batteries drawing a lot of current trying to charge from the truck alternator, Sounds like you have a self resetting circuit breaker tripping and resetting.
There is probably one in the line between the isolator and the coach battery(s). follow the wire from the isolator back to the coach battery and I bet you find a self resetting circuit breaker.