Troubleshooting Redarc Tow-Pro Liberty and 2025 Ford Ranger Towing a Travel Trailer  

Question:

Expert Reply:

Hey Allen!

Great to hear from you again!

You're right, the blue and green flashing pattern on your Redarc Tow-Pro Liberty # RED67CR means the controller is calibrating. The good news is that this is completely normal for a new installation, and you can actually finish the calibration process without your trailer connected!

First, let's tackle the calibration. You can disconnect your trailer and drive your Ranger normally, making several stops along the way. This allows the controller to learn its mounting orientation and the direction of travel. Redarc says this typically takes up to 20 brake applications, so don't worry if it takes a little longer than a trip around the block. Once calibration is finished, the controller will be ready for proportional braking.

One important thing to mention is that your Liberty can still operate the trailer brakes while it's calibrating, but it won't provide proportional braking until that process is complete.

As for your knob not lighting up when the trailer is disconnected, that can actually be normal! The controller enters a sleep mode when it doesn't detect a trailer. If you wait at least a minute after disconnecting the trailer and then press the knob, you should see a blue "breathing" light. This is where the light gradually gets brighter and then dims again. That tells us the controller has power and is responding, even though it doesn't detect your trailer.

Now, about the manual override. Redarc designed the Liberty's manual override to apply the trailer brakes while you're driving, so I wouldn't be too concerned about not hearing the brakes engage while you're sitting still. Once calibration is complete and the trailer is connected, you should see a solid blue light, which indicates that the trailer brakes have been detected. When you're moving and press the manual override, the light should change toward red as the trailer brakes are applied.

Before doing any driving with the trailer, though, I'd like to make sure everything is wired correctly. Since you had to run a separate power wire, I'd recommend checking that you're getting a steady 12V at the controller's black wire, that the white ground wire has a good connection, and that your new power wire is protected by a 30-amp fuse or circuit breaker. It's also worth checking that the brake signal wire receives power when you press the brake pedal. You can have the brake output circuit tested with a suitable test light before taking the trailer out to make sure the controller is actually sending power to the brakes.

Once everything checks out and calibration is complete, you can connect the trailer and test the brakes at a low speed in a safe, open area. I'd start with the gain below 5 and gradually adjust it until you have smooth, controlled braking without the trailer brakes grabbing too aggressively.

I'm especially curious about the factory power wire not having power. What gauge wire did you use for your new power connection, and are you getting that blue breathing light when you press the knob after the trailer has been disconnected for a minute?

expert reply by: Jerry B

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Redarc Tow-Pro Liberty LED light meanings
(click to enlarge)

Allen

11/11/2026

Hi Jerry, I finished installing the power wire and tested everything. With the trailer disconnected, the controller shows a blue light when I press the knob, just as you said it would. I drove the truck to let it calibrate, then connected the trailer and tested the brakes. Everything is working now. Thanks for your help!

Allen

11/11/2026

I was confused about the factory Ford harness not having power to that but it didn't even have the fuses in place so I guess they just left that out all together. When I ran the new wire, it is a 12 gauge and it is working well.

Jerry B.

11/12/2026

@Allen Perfect, that's great to hear! I'm glad to get you taken care of. Please let me know if I can help with anything else in the future. Safe travels!