This can t be easily wired into a 3rd brake light because you need a logic circuit to somehow only turn on the 3rd brake light on your camper shell when the brakes are applied and not flash with either signal light.
Truck cap third brake light wiring.
Truck cap wiring harness for third brake light and 12 volt dome light c90 907.
2 prong third brake light wiring harness a kit truck cap topper atc c90 801.
Wiring truck cap 3rd brake light aug 16 2017 12 29am isn t there a plug mid way in the truck on the under side for the third brake light roll bar back rack thingy you can get got the silverado sierras.
Fortunately ford has included a light green wire in the rear bumper wiring harness exactly for this purpose.