Looks like someone has been screwing around with your wiring. My best advice to you is to take it to a professional to have it diagnosed properly.

If you still want to try to tackle it yourself, I'd first look under the cover on the passenger side firewall for wires disconnected from the bus.

Here's a couple of wiring diagrams.

web page
web page

If you are in the Modesto Kalifornia area, I can take a look at it for you.

Clay

1990 Montero RS (In pieces... for now)

KG6VNX