Thor Forums

[bevedfelker]

From what I've researched on Thor Vegas/Axis they use either a Battery Control Center or the BIRD/Trombetta combination. When charging off the alternator both systems operate the same. It charges the chassis battery first, and when fully charged, checks the charge of the coach batteries. If low, it charges them and then switches back to the chassis. One important factor, the USE/Store switch must be in Use for the coach batteries to charge.

Not sure what your system has but I'd be surprised if it didn't have a system that charges both battery banks. It would be some type of isolation system to keep the chassis and coach batteries separated because if the coach batteries were very low they could drain the chassis battery. So there will be some kind of isolation circuit/relay, a charge status circuit, and switching device/relay to switch between coach & chassis.