Where Does Blue Wire of 7-Way Run to Power Trailer Brakes

Updated 05/27/2020 | Published 06/29/2016

Products Featured in This Question

Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4 Axles - Proportional

(2710)

$134.95

10 Gauge Wire - Blue Primary - Per Foot

(102)

$1.77

Question:

I have installed the 7 blade plug and the lights function properly. I have been told that my trailer connection will require power to the plug for the brakes to function. Do I connect the blue wire to the car battery with the black wire?

asked by: Charles R

Expert Reply:

If you are looking for a way to power the trailer brakes you would not run the blue wire of the 7-way to the positive post of your battery.

Instead you would run that wire up to the blue wire of a brake controller like the part # 90885 that you referenced. I attached a diagram that shows how a brake controller wires to a 7-way.

For wire to power the controller and wire up the output circuit we have the part # 10-1-1 which is 10 gauge wire sold by the foot.

expert reply by: Jameson C

click to enlarge

Tony W.

5/27/2020

I am purchasing anCurt echo controller...Your instructions say i need a functioning 7 pin. My car only has a 4 flat...If i buy the adapter, i still don't see how to connect the brake wire or the power wire thanks