Can Redarc Tow Pro Liberty be Tested/Calibrated without Trailer Connection
Updated 12/09/2025 | Published 11/17/2025
Question:
Hi, I bought a Redarc tow pro Liberty for my 2012 pilot. I installed the unit and checked that it was getting voltage from the car and a brake signal from the car as well. I don’t have a camper yet, picking up soon. How can I make sure the unit is calibrating since it does not light up with out a trailer? Are there pins I can jumper on the 7pin connector to make it think there is a trailer. Just want to make sure it’s okay before I go to tow my new to me trailer. Thanks Will
asked by: William S
Expert Reply:
Hey William, in electric mode the Redarc Tow Pro Liberty you have will look for the amperage draw of trailer brake magnets on the 7-way 5:00 pin before it will show a connection...but if you put it in hydraulic mode it would just need to see a connection so you would want to put it into hydraulic mode and then if you use any type of circuit tester it would register it as a trailer connection and would allow you to verify it is working.
As far as calibrating it without a trailer I don't think you can do that effectively so I would wait till you have a trailer.
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Jameson C.
12/8/2025
Hey William, how did things go once you picked up your trailer and tested the Redarc Tow Pro Liberty? Did the controller calibrate and show a proper connection in electric mode? Your update could make it easier for others setting up the same brake controller.