Aftermarket Plug & Play Harness Compatibility with Tow-Pro Liberty

Affected Vehicles: 2018+ Toyota 4Runner

Part Number: RED24FR

It has come to REDARC's attention that some vehicle models, in particular, Toyota 4Runner MY18+, have implemented an additional diode in-line with their factory tow package harness (i.e. the electric trailer brake controller connector, brake light trigger circuit). This diode has been introduced to eliminate any positive back feed being applied to the vehicle brake light circuit, in the event of the electric trailer brake controller emergency over-ride being applied.

This additional vehicle diode, if connected with an aftermarket plug & play vehicle-specific brake controller harness with a diode, causes the brake light trigger voltage to be lower than the voltage at the Tow-Pro Liberty battery input (BLACK wire) by 1.5 Volts or more, which will result in the Tow-Pro Liberty not calibrating.

It has been determined that Tow-Pro Liberty's (Part Number EBRH-ACCNA) manufactured with a serial number starting with 2006xxx, 2007xxx or 2008xxx may be affected by this issue. Please refer to the small white label on the side of the Tow-Pro Liberty main unit for your serial number.

Changes are currently being made to the Tow-Pro Liberty to eliminate this issue. In the meantime, if your Tow-Pro Liberty does not calibrate, please contact REDARC directly for a replacement and free of charge plug & play harness that will overcome this issue.

Phone: USA +1 (704) 247-5150, Canada +1 (604) 260-5512 or Mexico +52 (558) 526-2898

Email: [email protected]

Locating the Product Serial Number

The image below indicates where the Product Serial Number is located on the Main Unit and on the Product Packaging.

The Serial Number Label contains the Part Number (circled in BLUE below) and the Serial Number (circled in RED below). The first 4 digits of the serial number indicate the YEAR and MONTH of manufacture, in the form YYMM.

Updated On: 10/15/20

Explore Expert Info

on Trailer Brake Controller

Videos

for Trailer Brake Controller

Help Articles

for Trailer Brake Controller

Expert Answers

for Trailer Brake Controller

Redarc Tow-Pro Liberty Brake Controller Installation - 2023 Toyota 4Runner

Finding the Right Trailer Wiring Harness

How to Choose a Trailer Brake Controller

Redarc Tow-Pro Liberty Brake Controller Review RED24FR

Redarc Tow-Pro Trailer Brake Controller Plug-and-Play Wiring Harness Review

Feature Breakdown: Universal Installation Kit for Trailer Brake Controller

An In-Depth Look at the Curt Echo Wireless Brake Controller

In-Depth Review of the Universal Installation Kit for Trailer Brake Controller

Making sure the Redarc Tow-Pro Liberty Brake Controller Fits

How to Install: Curt Echo Wireless Brake Controller on your 2020 Subaru Outback Wagon

What to Know About the Curt TriFlex NEXT Trailer Brake Controller

Trailer Maintenance Schedule

Brake Controller 7- and 4-Way Installation Kit (ETBC7)

Trailer Wiring Diagrams

Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)

Brake Controller Installation: Starting from Scratch

How to Measure for Trailer Hitch Drop

Towing a Trailer? Let's Talk About Brake Controllers

How to Choose the Right Trailer Hitch Class

My Trailer Hitch Doesn't Fit

5 Things to Know About Weight Distribution Hitches

Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)

Rooftop Cargo Carriers

What is the Difference Between a 4-Way and 7-Way Trailer Connector

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

view full answer...

What is the Difference Between a Class II and a Class III Hitch?

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

view full answer...

What Is An OEM Prep Package And How Do I Know If I Have It

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

view full answer...

My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

view full answer...

For your 2024 Nissan Frontier I recommend the Redarc Tow-Pro Liberty Brake Controller #RED24FR. I like the Liberty because it is simple, reliable, and looks great in any vehicle. The main unit installs behind the dash, so only the control knob will…

view full answer...

Wiring and Brake Controller Needed for 1996 Ford F-150 with 4-Way Flat

Hey John, thanks for reaching out! If the 4-Way on your 1996 Ford F-150 is from the factory then the only wire splicing you'll need to do is with the Adapter #37185, which plugs into your 4-Way and then you'll connect the rest of the wires to…

view full answer...

Difference Between Redarc RED98CR And RED82CR For 2022 Toyota 4Runner

Hey Mark, thanks for reaching out, and good question. Both the Redarc #RED98CR and #RED82CR are correct for your 2022 Toyota 4Runner. The only difference is the #RED82CR comes with the universal mounting panel for the knob, while the #RED98CR does…

view full answer...

Parts Needed to Install 7-Way and Brake Controller 2024 Toyota Grand Highlander

We can definitely help install a brake controller and 7-way on your 2024 Toyota Grand Highlander but first the brake controller I recommend is the Redarc Tow Pro Liberty part #RED24FR with the install harness part #RED69FR. As this controller puts…

view full answer...

Lug Nut Torque Chart for Trailer Wheels

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

view full answer...

Complete Towing Setup With Brake Controller for 2025 Honda Odyssey

Hi Mike! Do you want a completely hidden hitch or one where only the receiver is visible? The Curt #C64NR you looked at has a concealed cross tube so you will only see the receiver hanging down at the rear. The Hidden Hitch by Draw-Tite #DT76GR will…

view full answer...

Mounting Inserts for the Redarc Tow-Pro Liberty Brake Controller

Yes, when installing the knob for the Redarc Tow-Pro Liberty Brake Controller item #RED24FR you will want to remove any extra material behind the insert. I am happy the video was able to help you out. I have linked a couple of pictures from the video…

view full answer...