No dome light.

I'm currently working on a 1995 Dodge B2500 van with the Starcraft conversion package. I have no dome light whatsoever. Checked the bulbs, light fixture and fuses and everything checks out. I have replaced the headlight switch twice now (from Autozone) and still no success. I have even ran a seperate ground wire directly to the battery to a prong on the side of the head light switch thinking ground may be bad. If I turn the light switch to the left the illuminated ring around the ignition key stays on and drains the battery, but still no dome light. There are a bunch of relays both under the hood and in the glove compartment area. But which one do I change or check? From what I found there is about 9 in total. Another problem is, when the driver's door is open the buzzer goes off, however the 2 side doors and the back door does not set the buzzer off. All the other conversion lights work, reading, courtesy, valance and the TV/VCP work. Checked all the circuit breakers under driver side dash for the conversion package and they seem to be working properly. Power supplied to both terminals. What do I do next other than taking it to to the dealer to figure it out aat $100 an hour!

Another problem I have is I recently bought a Reese 4 flat wire harness that just plugs right in to the back for trailer lights. The white wire coming out does not give me a ground. I can touch a bolt in the back and put my test light to the other plug wires and I get juice to the other 3 wires. Could this be a related to the problem also with no dome light?

Any help would be greatly appreciated.

Thanks!