How to Find the Stop Light Circuit on a 2018 Jeep Grand Cherokee

Published 08/08/2018

Products Featured in This Question

Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End

(156)

$12.65

Roadmaster Stop Light Switch Kit

(708)

$52.10

Question:

the three wires by brake pedal ,one hot all time the other two for brake lights but neither will power the controller,what can i do to fix it ?

asked by: Mike

Expert Reply:

For starters, have you checked for the brake controller adapter port under the drivers kick panel near the emergency brake pedal (see video). If not I recommend doing so as most of these vehicles came with the brake controller adapter port regardless if yours came with the factory tow package or not. If you have a Tekonsha brake controller like the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 and you have the brake controller adapter port then you can use the Tekonsha Plug-In Wiring Adapter part # TK93VR which eliminates having to find the stop light wire.

If you are sure that you do not have the brake controller adapter port then I believe your vehicle has what is called pulse width modulation (PWM) which means the stop light switch wire will not be accessible behind the brake pedal and you will want to use the Roadmaster Stop Light Switch Kit part # RM-751449. I have attached an install video of this for you.

expert reply by: Conner L