Originally Posted by geoman
WW, I had to remove the circuit breaker connections as the 2 cables were right on top of the engine battery.
The only other batteries are the coach batteries.
Unfortunately I haven't been able to find any wiring diagram in the manuals.
G, I'm trying to get my head around this. The photo the other member posted, you see only two cables. Is this the case with your connections? You apparently can't tell which goes to the battery. What I would do is with 120vac power disconnected (don't want to read 12v if being charged by the converter) see if there continuity to ground on one of the cables. It shoud read near zero ohms, not up in the 1000s of ohms. If yes, this should be AUX, if the other read ohms, we haven't proven anything, but try this first.
Put meter on ohms (auto if you have that); one lead on a KNOWN ground; and the other to the cables under test.
If only one cable read continuity (grounded) and one doesn't (or open to ground - no ground); I bet the open one would go to the battery and the one with continuity is a distribution panel.
If you need more info, contact me.