Paul, I have the '94LY diesel pusher too. I have a total of 4 batteries - 2 in the back for the chassis and 2 in the front for the coach. The rear batteries are placed one on each side of the rear compartment, and the road side one has a knife switch on the battery post. These two batteries are used mainly to start the engine and the generator.
In the front there are two batteries located under the hood on the curb side, with a knife switch on one of them. The front batteries are deep cycle marine types, and I'm not all that sure how good they are now.
On the rear firewall, top left while looking in are the ATS switches, which we have rewired to convert the shore power from 115v-30 amp to 230v-30 amp (which acts effectively the same as what is referred to as 50 amp service) so that we can run both a/c units when plugged into 50 amp service.
Have you got the manual for your unit? The manual has the entire electical system laid out in block diagrams. Some items referred to in mine don't seem to show up on my MH, though.
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel