Prodigy Trailer Brake wiring

[Slugblaster]

I am trying to hook uo a new prodigy electric trailer brake along with wiring my truck to pull a trailer. I have found the blue and orange wire provided by GMC on my 95 pickup. All seems easy enough except the red wire from the brake control unit to the cold side of the stop light switch. I can't find it. Any help appreciated.

[Kennedy]

The cold wire is white, and will iluminate a test light when you press the pedal.

Check closely, as there is also a cruise break wiring as well as brake light wiring. Brake lights typically have orange and white together in loom.

[Slugblaster]

Thanks. Found it.