Circuit to Use to Power Third Brake Light of a 2010 Chevy Silverado

Question:

2010 chevy silverado with factory 7 wire towing package. have topper on truck. bought a kit that installs a 7 way in bed of trailer. brake blue is not hot when pedal is pressed. the controller says something is connected but high stop will not come on. if i try the button to test brakes then the high stop comes on. can i connect to orange wire to blue and then use the center wire on seven pin for brake light on topper?

asked by: Dan J

Expert Reply:

If you are looking to power the third brake light of a camper shell 7-way wiring is not the correct place to track down this circuit.

In the brake controller wiring under the dash of your 2010 Chevy Silverado there will be an orange wire labeled CHMSL. This is the correct circuit to use to power the third brake light of your topper.

You can also try tracing the factory wiring harness that plugs in rear of the 7way. Remove the wire loom and a few feet back you might find a light blue wire that's for the CHMSL on a camper shell.

expert reply by: Jameson C