Both rear and top (3rd) brake lights are out. Ive replaced the stop switch and the turn signal multifuncton switch. All bulbs and fuses are fine. Im guessing a bad wire? How do i find out?

2008 Dodge Dakota 3.7L V6 Crew Cab

 

Get a meter and start tracing wires.

 

Yeah I borrowed a circuit light up tester. Ill let you know what i find. Thanks for the response

 

Dealership said my TIPM is bad and wants to charge$1100 to replace it. Is that something I can replace myself?