Originally Posted by unkel
The House batteries on our RV do not charge while underway and the aux start button does not work. Has anyone else had these problems? do you have any fixes for them? Thank you.
Probably the battery isolator relay (boost relay). You need to verify if it works or not. This relay connects your house batteries to the chassis batteries. There is usually a device that activates the relay to keep the house batteries charged from the chassis while driving.
Your Aux Start button manually activates this relay.