So, I just bought a Tekonsha P3 electronic brake controller. I also have the Nissan wiring harness kit to connect it, however, there is a difference in the number of wires for each.
The wiring harness (WH) has the following 5 wire colour designations:
RED/GREEN - Vehicle stop lamp switch to trailer brake connector
BLACK - Brake connector ground
BROWN/WHITE - Trailer brake controller switch output
RED/BLUE - Trailer brake controller illumination
RED - Fused trailer brake controller battery feed (B+)
The Tekonsha P3 has the following 4 wire colour designations:
BLACK - Positive battery
WHITE - Negative battery
RED - Cold side of stoplight switch
BLUE - Brake output to trailer
So, its easy enough to see that:
WH Black connects to P3 White
WH Red connects to P3 Black
But what about the rest? I have 3 WH wires and 2 P3 wires left over.
Thanks much.