Won't Start 1992 Bounder

[Bussman]

The engine won't turn over, I though it was a battery issue, so I replaced it. Nothing. The main disconnects above the door do nothing when switched. It did it a few weeks ago, but then began to work. I don't know where to start troubleshooting. I feel it has to be a relay or something but don't know what to look for. Any help would be appreciated.

[pop-sicle]

You did start with your troubleshooting you replaced the battery.
There are so many things it could be, first I would make sure it is in park.. could be park / neutral switch try it in neutral also just to rule out that it isn't activating park switch.
Could be the ignition switch
By pass the ignition switch by jumping starter
when you say the main disconnect above the door I am guessing that would be to disconnect house batteries.
Someone will come along with more info.

[Bussman]

There are two switches over the door. One is main batteries and one is aux batteries. Neither one makes any noise when switched. Even with the new battery there's no power in the coach at all....main or aux.

[easywind]

I would start with checking the battery cables especially the ground first.