where can I wire in the third brake light on cap into wiring harness on 07 dakota? I wired into tail lights it works till you turn the turn signals on
Update found the wire by the license plate plug thanks for the help.

 

Do you have a 4 pin or 7 pin trailer connector? Wire it into that.

 

I was thinking of that I have 4pin going out in a little bit to try it

 

There will be a blue & white wire available near the license plate wiring. Picture in this thread.