was this one of you guys??

Muddydogs wrote:
If the driver had used the brake controller the trailer brake light should have lit up so I have to assume he never touched the brakes.

Maybe Integrated brakes light up, but my brake controller won't light my brake lights.

From eTrailer.com wrote:
http://www.etrailer.com/question-25947.html
Should Vehicle Brake Lights Come On when Using Manual Override on Agility Trailer Brake Controller
Question:
I have used older model brake controllers in the past and when pressing the manual override button on them without a trailer connected my vehicles brake lights would come on without depressing the brake pedal. With this unit they do not come on in this situation. Is this normal or have I wired it wrong in my vehicle?
asked by: Lee

Expert Reply:
When using the manual override on a brake controller, including the Hopkins Agility Electric Brake Controller, # HM47295, the vehicle brake lights should not come on. Most modern brake controllers do not activate the vehicle brake lights, though there are some older models that did which must have been what you had.

The way the manual override works is that it bypasses the signal from the brake switch and sends power directly from the controller to the trailer brakes. Brake lights coming on would seem to indicate that something is not wired correctly or there was a short circuit somewhere and/or corrosion on the trailer connector on the vehicle.

On a brake controller, the white wire is ground, the blue wire is electric brake output, the red wire attaches to the cold side of the brake switch, and the black wire is 12 volt power. It sounds like you have the brake controller wired correctly if the vehicle brake lights do not come on with the manual override.
expert reply by: Michael H