This all started when I put in a after market radio a few months ago. At first my tail lights and all interior lights stopped working. I traced it back to the dimmer wire in the radio wiring. I ended up wiring this wire to the ignition wire in the radio which would turn all these lights on when the radio was on as well. This worked for a while until my tail lights stopped working again. While this dimmer wire is connected all my interior lights will come on but the tail lights are now out. I checked bulbs and they seem to be good. I tried the #13 relay and still no luck. The only other thing that ive thought of is the tow light connecter that is corroded and the wires are a little exposed. If anybody knows anything that would help it would be great.