Really weird light problem

[Milkman Dan]

So, first things first... I found out the instrument cluster lights didn't work on my way home from picking it up. When I turn them on, the right turn signal light kind of dimly turns on.

Lights off, left turn signal on = Front left signal and bottom light flashing.
Lights off, right turn signal on = both bottom lights, all turn signals, and rear indicator lights flashing.

Lights on, left turn signal on = Front left signal and bottom light flashing.
Lights on, right turn signal on = Turn signal light goes bright, no lights flash.

I also noticed the license plate light turns on when the brakes are applied.

Ideas on where to start looking?

[zieg85]

Classic lack of ground issue.  Check the grounds in the rear

[Milkman Dan]

Well, I took a look at the wiring in the rear. Oh boy, is it a cluster. Looks like they swapped out a lot of the wiring with generic black wire. So, I'm going to have to trace everything. :|

[bake74]

      Go to the tech section and get a copy of the wiring diagram for your truck.  Then start tracing and finding the bad grounds or shorted sections and repair.