Brake Controller Wire Functions

If you're towing a trailer with brakes you have to have a brake controller installed on your vehicle to activate your bakes. When installing your brake controller, you will see that they have the same four colored wires. In this video we go over the wires and their functions to help you better understand how your brake controller works. This will help you install and diagnose issues you may have with your brake controller.

ABOUT U-HAUL Since 1945, U-Haul has been the No. 1 choice of do-it-yourself movers, with a network of more than 21,000 locations across all 50 states and 10 Canadian provinces. U-Haul Truck Share 24/7 now offers customers access to U-Haul trucks every hour of every day through the self-service options on their Internet-connected mobile devices. U-Haul customers’ patronage has enabled the U-Haul fleet to grow to more than 150,000 trucks, 112,000 trailers, and 40,000 towing devices. U-Haul offers more than 581,000 rooms and more than 51 million square feet of self-storage space at owned and managed facilities throughout North America. U-Haul is the largest installer of permanent trailer hitches in the automotive aftermarket industry and is the largest retailer of propane in the U.S.

[sizzelot]

Im confused about the red wire. He said at about 1:17 that when the pedal is pushed the brake light switch sends a signal to the brake controller which then sends a signal through the red wire to the trailer brakes. Shouldn't the red wire send a signal to the trailer brake lights and not the brakes themselves as sending power to the brakes would be the function of the blue wire?

[AM-dnlk]

Does the blue wire which is the brake activation on the trailer, also connect to the brake stop light on the trailer?