How To Test the Redarc Tow-Pro Liberty w/out a Trailer

Updated 03/11/2025 | Published 03/07/2025

Products Featured in This Question

Redarc Tow-Pro Liberty Brake Controller w/ Universal Wiring Harness - Dash Knob - Proportional

(2821)

$217.00

Digital Multimeter with 42" Long Test Leads - LED Display

(3)

$21.20

Question:

Hello.. I have just today managed to fit the RedArc brake kit to my 2024 Subaru OBW. seems to work and lights up the dial blue and green etc..BUT..how can I tell if it is actually operating my Camper Trailer brakes..? What test can I do to be sure..? Thanks

asked by: Derek A

Expert Reply:

Hey Derek welcome back! The only way too test the Redarc Tow-Pro Liberty Brake Controller item # RED52VR, without driving your trailer around, is to use the manual override and a multimeter like item # PT89ZR.

You will want to adjust the power to the maximum setting of 10 on the Tow-Pro item # RED52VR. Then you'll use your multimeter to test for voltage at the brake output on your Subaru's 7-Way connector. Someone will have to sit in your Outback and apply the manual override on full while you are testing. You should be getting 11-12 volts if you've got it installed correctly.

If you have any additional questions, go ahead and throw them into the comment box below and I'll be happy to help you.

expert reply by: Jerred H