On my 95 chassis(96 titled) I only have the aux battery on the pass side. That charging relay shows in Ford's schematics but I cannot find it. I though it was inside the Powerbox located under the brake master cylinder. After digging the cover off, it was not there! Ever since I owned the bus, there was a charging problem to the aux battery. Well last sunday it finaly dumped out and would not charge the aux battery at all.

I did a quick bypass wire from the main battery though a knife switch to the aux battery. That made a big time change on how the aux battery is being charged. I now can run the rear AC and have amperage to spare!!

I'm going to do a total rewire of the coach electrical systems so I know what I have.