What Type of Signal Does a Trailer Brake Controller Generate

Updated 10/25/2017 | Published 10/24/2017

Question:

Does the trailer brake controller output a DC voltage that goes from low to high as more braking power is needed? Or does the controller generate a PWM signal to vary the effective voltage to the brake magnets? We have so many trailers that often have problems, and I want to build a light/brake tester box.

asked by: Mister B

Expert Reply:

Trailer brake controllers such as the excellent Prodigy series, models P2 # 90885 and P3 # 90195, generate a varying DC output voltage depending on the power/boost setting on the controller.

If set at full power such units will generate a bit over 12 volts to the brake magnets; lower power settings will deliver reduced voltage to the brake magnets and deliver lower braking pressure.

You may find the linked articles on trailer brake controllers to be of interest.

expert reply by: Adam R