Does Prodigy P3 Work on Semi With Air Brakes but Trailer With Electric Brakes

Question:

I am installing the P3 brake controller in a vintage semi tractor with air brakes and a 9 pin round connector to a 7 pin flat on the trailer. When I hit the brakes on the tractor what tells the controller to activate the electric brakes on the trailer? 1980 model semi tractor.

asked by: Robert

Helpful Expert Reply:

The Tekonsha Prodigy P3 Trailer Brake Controller # 90195 will work on a semi so long as as it is connected to a circuit that sees voltage when your semi's brakes are applied, which is generally the stop light switch on passenger vehicles though yours may be different. So long as you have that linked up, the P3 will work great.

expert reply by: Kyle S