Troubleshooting Redarc Tow Pro Elite That No Lights Come On

Question

Question:

My controller light isnt coming on. Not recognizing trier plug in. Havent had this problem before. How can I troubleshoot this?

asked by: Joe A

0

Expert Reply:

Since the Redarc Tow-Pro Elite Trailer Brake Controller - 1 to 3 Axles - Proportional # RED44FR you have does not have any lights you are correct that it is not recognizing that a trailer is connected.

What you will need to do is inspect the 7-way connector on your tow vehicle and trailer looking for any corrosion or debris in the connectors that can cause a connection issue.

If the connectors look good double check the wiring on the vehicle and trailer side to verify that no wires have come loose, or have damage causing a connection issue.

I included a video of the # RED44FR for you to take a look at.

expert reply by: Samuel C

0

Nathan R.

3/18/2024

Everything looks good, wires are essentially new. No problems with wiring, all the other lights work on my tester except the “brake” and the controller knob doesn’t light up. Is there anything I should be looking at? I installed this unit about a year ago but have never used it, I’m planning a camping trip and thought I should check it and of course now it doesn’t light up. -Nate

Mike L.

3/19/2024

@NathanR What's the year/make/model of your vehicle?

Nate

3/19/2024

Hi @MikeL ! it's a 2021 Wrangler JLU diesel.

Mike L.

4/6/2024

@Nate Can you tell me which tester you're using? Is there a friend or neighbor who has a trailer with brakes you can test the controller with? Have you tried using the manual brake button? The controller won's show a connection unless there is a proper voltage draw on the trailer connector, and it won't output voltage unless the vehicle is in motion or the manual brake button is pressed...

See All (10) Replies to Nathan R. ∨

Brooke K.

7/9/2025

I had the same problem. I hadn’t towed for about 8 months. The LEDs would not light. After checking the connectors and wiring I unplugged the brake controller from the vehicle for a few seconds and plugged it back in. It’s working normally now.

Jameson C.

7/9/2025

@BrookeK Glad you got it to work!

Answer 1

Using the cut off wiring harness you have for the P3 part #90195 you will wire it to the brake controller wiring of your 2023 Ford Ranger which is sticking out of the large wire harness that goes through the driver's side firewall, left of the…

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Answer 2

Hi Robert, Yes, both the Tekonsha Primus IQ #TK90160 and Plug-In wire harness #3050-P would be a compatible fit for your 2018 Nissan Armada. To activate the brakesYou'll also need a 7-way socket at the back of your Armada for the trailer to plug…

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Answer 3

In regards to the Redarc Tow-Pro Liberty Brake Controller part ##RED24FR, the unit should not be illuminated while driving without a trailer. If you press the button while a trailer is not attached you should see a breathing blue light and that…

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Answer 4

I attached a picture that shows where we found the brake controller install connector on a 2016 Ram 1500 to install the P3 part #90195 and install harness part #3024-P. I also attached an install video that shows the entire process as well.

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Answer 5

The best way to test your Redarc Tow-Pro Elite #RED44FR or Liberty #RED52VR brake controller is by cutting the blue wire coming out of it about 6" away from the controller and using a circuit tester to make sure power is coming out of the…

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Answer 6

For your 2019 Ford Ranger the Redarc Tow-Pro Elite Trailer Brake Controller #RED44FR is a really great option but the correct install harness is actually the part #331-TPH-007 which plugs in easily under the dash and not what you mentioned. I…

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Answer 7

It could need a fuse, less likely that it would need a relay but you can check the fuse panel lids to determine if there is one that is missing for brake controllers, tow package wiring, CHMSL, or stop light. If that is not the issue then you would…

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Answer 8

Since everything else is working on your Redarc Tow-Pro Liberty Brake Controller #RED24FR there may be a problem with the light pipe on the control knob. there is a 90 degree light pipe which is what brings the light up and out through the button. If…

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Answer 9

Hello John. The correct Redarc plug-and-play kit for your 2016 Ram 1500 is part #RED87CR. This comes with the Redarc Tow-Pro Liberty Brake Controller as well as the custom plug and play pigtail for your 2016 Ram.

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Answer 10

While I can sympathize with your issue, it is not safe to tow a trailer if you only have a 2" hitch ball and your trailer coupler is designed for a 2-5/16" hitch ball, even for a short distance; the insecure connection between hitch ball…

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Answer 11

Hello Rob, thanks for reaching out. So it is normal for the Redarc Liberty controller to have a blue light when the trailer is not hooked up. This just means it isn't detecting trailer brakes. If you used a custom plug-and-play harness, I would…

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Answer 12

An electric trailer brake controller is a device that installs in the cab of your tow vehicle and activates your trailer's electric or electric-over-hydraulic brakes when you hit the brakes in your tow vehicle. It's not a binary activation.…

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Troubleshooting Redarc Tow Pro Elite That No Lights Come On

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