Checking Electric Brakes For Proper Voltage in System

Updated 07/05/2018 | Published 07/03/2018

Products Featured in This Question

Dexter Electric Trailer Brake Assembly - 10" - Right Hand - 3,500 lbs

(303)

$83.92

10 Gauge Wire - Blue Primary - Per Foot

(108)

$1.61

Digital Multimeter with 42" Long Test Leads - LED Display

(3)

$21.90

Question:

how many volts should i have at the brakes when i the controller in the truck is at max power? not sure if i have a brake problem or a controller problem?

asked by: Howard

Expert Reply:

The voltage at the black wire running into your controller should be at 12-13 Volts when checked with a multimeter like # PT89ZR. When checked at the 5 o'clock pin on your 7-way with the manual override lever engaged and with the controller set to max output it should read 12 Volts. At your brake magnets, it should read 11-12 Volts. If it is less then you will need to check your ground connections to ensure bare metal to metal connection and also check your brake magnet power wire. If it has insulation missing, is pinched or crimped, then replace with # 10-1-1 sold by the foot. Finally, check your brake magnets. I've attached an article.

expert reply by: Jason S