Multimeter Recommendation for Testing Voltage Drop of Brake Controller Install

Published 11/22/2017

Question:

I have tested the wires at the brake controller to make sure the black is hot, the red is hot when I push the brakes and the blue is giving off a signal with the manual override, however when testing the 7 round on the back end of the RV and adjusting the level of the brakes through the controller. I am not seeing a difference in the light. On my Ram when I do this the light will gradually illuminate as I increase the pressure. Think you can help? It is a prodigy p2

asked by: Philip

Expert Reply:

You're going to want to use a multimeter like the # PT89ZR which will show exactly what the voltage is on the brake output pin of the 7-way. Otherwise without knowing what the voltage is exactly it's hard to speculate why there would be an unknown potential voltage drop.

Measure the voltage near the controller like you did and on the output pin and let me know what's going on. Keep in mind that this is proportional controller so the only way you'll see full voltage on that pin is with the override lever.

expert reply by: Jameson C