Finding the Stop Light Wire on the Brake Switch to Install a Brake Controller on 1999 Toyota Tacoma

Question:

How do I find out which wire is 12v on the brake switch to connect the red wire to. For a 1999 Toyota Tacoma

asked by: Curtis

Expert Reply:

When installing a brake controller like the Tekonsha P2, # 90885, you will need to use a circuit tester like # PTW2993 to find the stop light wire on the brake switch above the brake pedal.

You will probe the wires until you find the one that carriers a signal ONLY when the brake pedal is pressed. It will not carry a signal at any other time. Once you find this wire, connect it to the red wire on the brake controller.

I have included a link to an FAQ article below that discusses the brake controller installation process in greater detail.

expert reply by: Michael H