2026 Audi S5 Vehicle Tow Bar Wiring

Name: Universal Magnetic Tow Lights - 20' Wiring Harness with 4-Way Flat Trailer Connector
Brand: Optronics
SKU: TL21RK
Price: 62.88 USD
Availability: InStock
Rating: 4.65641025641026 (195 reviews)

Expert Review Video:

Choosing the Right Tow Bar Wiring

Filters

Universal Magnetic Tow Lights - 20' Wiring Harness with 4-Way Flat Trailer Connector

195 reviews

Code: TL21RK

$62.88

Retail:$75.95

You Save: 17%

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
4 Flat

Features:

Stick these heavy-duty magnetic lights on the back of your car and they'll stay there. Nice and secure, these are also the easiest way to get brake and turn signals on your towed car, trailer, or cargo carrier without doing any hardwiring.

More Information >

Heavy-Duty Magnetic Tow Light Set - Red Incandescent - 30' Harness with 4-Pin Round Plug

45 reviews

Code: 337TL257M

$81.72

Retail:$101.16

You Save: 19%

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
4 Round

Features:

Heavy-duty kit gets you tow lights that will last for the long haul, with rubber-coated housing, powerful magnetic bases, and a robust wiring harness. Displays brake and turn signals on your trailer or towed car. Comes with a handy carrying case.

More Information >

Demco LED Tow Light Bar for Towed Vehicles w/ Wireless Transmitter - 12V Power

14 reviews

Code: DM36MV

$415.00

Retail:$490.00

You Save: $75.00

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
7 Round

Features:

This LED light bar plugs right into your 12V outlet and needs no hardwiring, while the transmitter plugs into your RV's 7-way socket. Uses a suction cup to attach to your car's back window.

More Information >

Universal Magnetic Tow Lights - Red LEDs - 20' Wiring Harness with 4-Way Flat Trailer Connector

21 reviews

Code: PE26UR

$107.91

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
4 Flat

Features:

Stick these bright, efficient LED lights on the back of your car and plug them in - done. This is the easiest way to get brake and turn signals on your car, trailer, or cargo carrier without doing any hardwiring. Requires 4-pole flat plug.

More Information >

Universal Magnetic Tow Lights - Red LEDs - 20' Wiring Harness with 4-Way Flat Trailer Connector

195 reviews

Code: TLL21RK

$67.90

Retail:$75.66

You Save: 10%

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
4 Flat

Features:

Stick these bright, efficient LED lights on the back of your car and plug them in - done. This is the easiest way to get brake and turn signals on your towed car, trailer, or cargo carrier without doing any hardwiring. Requires 4-pole flat plug.

More Information >

Roadmaster Universal Magnetic Tow Lights with 4-Way Flat Trailer Connector

42 reviews

Code: RM-2120

$81.21

Retail:$100.15

You Save: 19%

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
4 Flat

Features:

Stick these magnetic lights on the back of your car and plug them in - done. This is the easiest way to get brake and turn signals on your towed car, trailer, or cargo carrier without doing any hardwiring. Requires 4-pole flat plug.

More Information >

Wireless LED Tow Light Bar - Magnetic - Weatherproof - 23" Long - 7-Way Round

70 reviews

Code: LIW-LDTL-7B

$329.82

Retail:$503.02

You Save: $173.20

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
7 Round

Features:

This LED light bar is completely wireless, receiving brake and turn signals from a transmitter plugged into your vehicle's 7-way round. It runs on a rechargeable battery. Weatherproof and super durable, it mounts securely with heavy-duty magnets.

More Information >

Wireless LED Tow Light Bar - Magnetic - Weatherproof - 23" Long - 4-Pin Round

70 reviews

Code: LIW-LDTL

$314.76

Retail:$503.02

You Save: $188.26

In Stock

Flat Tow Wiring Harness Specs:

Bypasses Vehicle Wiring
Removable Tail Light Kit
Universal Fit
4 Round

Features:

This LED light bar is completely wireless, receiving brake and turn signals from a transmitter plugged into your vehicle's 4-pin round. It runs on a rechargeable battery. Weatherproof and super durable, it mounts securely with heavy-duty magnets.

More Information >

Explore Expert Info

on Flat Tow Wiring Harness

Videos

for Flat Tow Wiring Harness

Help Articles

for Flat Tow Wiring Harness

Expert Answers

for Flat Tow Wiring Harness

An In-Depth Look at the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit

An In-Depth Look at the Roadmaster Battery Charge Line Kit for Towed Vehicles

Choosing the Right Tow Bar Wiring

Breaking Down the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit

Breaking Down the Blue Ox Patriot Portable Flat Tow Brake System

Installation: Blue Ox Patriot Portable Flat Tow Brake System on a 2022 Ford F-150

How to Install the Roadmaster Universal Hy-Power Diode Wiring Kit on a 2021 Jeep Wrangler

Setting up the Curt Custom Tail Light Wiring Kit for Towed Vehicles on a 2023 Jeep Wrangler

Complete Breakdown of the Roadmaster Battery Charge Line Kit for Towed Vehicles

Roadmaster Brake-Lite Relay Kit Comprehensive Review

No Setup. Full Safety. Demco Breaks Down Their Supplemental Braking Systems

Installation: Curt Custom Tail Light Wiring Kit for Towed Vehicles on a 2024 Jeep Wrangler Unlimited

Best Vehicles to Flat Tow Behind an RV

Trailer Wiring Diagrams

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

Flat Towing Package for 2007-2018 JK Jeep Wrangler and Wrangler Unlimited

Must-Have Flat Towing Components

Roadmaster Vehicle Specific Base Plates

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

We Used 34 RV Tow Bars, and These are the Best for Flat Towing

Flat Towing Package for 2012-2014 Honda CR-V

Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)

How to Choose a High-Low Adapter

The Definitive, Step-by-Step Flat Towing Setup Guide

Does the Curt Base Plate Kit Work w/ the Ford Modular Bumper on a 2025 Ford Bronco Everglade?

Yes, it does John. So long as you have the Ford Performance Heavy Duty Modular Front Bumper with the tow hooks, the easiest way to flat tow it is to use the Curt Custom Base Plate Kit item #C59JR. This adapter connects right to the tow hooks without…

view full answer...

Which is Better Roadmaster or Blue Ox Tow Bar

Both the Roadmaster and Blue Ox tow bars are great options. But if it was my decision to make I would go with the Blue Ox Avail part #BX7420 as we have found that the Blue Ox tow bars are a little easier to connect and disconnect from. Also this tow…

view full answer...

Choosing Between the Brake Buddy Select 3 and the Blue Ox Patriot Supplemental Braking System

When it comes to choosing between the Blue Ox Patriot #BLU37TR and the Brake Buddy Select 3 #HM39524, these systems are extremely similar in their setup and functionality. Both of these systems provide proportional braking in a compact and easy to…

view full answer...

Hey Christian, welcome to the world of RV-ing! So in addition to the Roadmaster Nighthawk #RM-676 you're also goin to need: - A baseplate kit, like the Roadmaster Direct-Connect Base Plate Kit #RM-521453-5. These attach to the Jeep itself so you…

view full answer...

Hey Steve, thanks for reaching out! The Roadmaster Direct-Connect Base Plate Kit #RM87NQ fits your 2025 Ford Maverick as long as it's the Hybrid model that doesn't have the engine block heater. It doesn't come with the 6-Pin connector,…

view full answer...

What is the Difference Between the Blue Ox Patriot BRK2019 & BRK2022?

Gladly! The difference between the Blue Ox Patriot 3 Radio Frequency, Portable Braking System BRK2019 and the Blue Ox Patriot Radio Frequency, Portable Braking System #BLU37TR is that the Blue Ox Patriot 3 RBRK2019 is older, no longer available, and…

view full answer...

Parts Needed to Flat Tow 2025 GMC Canyon

Hey Steven, yeah the Blue Ox Avail part #BX7420 is a really solid tow bar and would work great for you. The correct base plate kit for a 2025 GMC Canyon would be the Blue Ox part #BLU85CR. For braking the Blue Ox Patriot part #BLU37TR is a really…

view full answer...

How to Make an Adapter to Go from Semi Truck 7-Way Round to RV Style 7-Way Blade on Trailer

Either way is correct. It depends on if you want to keep the semi-style 7-Way (if you need to tow that type of trailer) or if you will never be towing a semi-trailer. If you need to keep the 7-Way semi active on the truck, then you would need to make…

view full answer...

Flat Tow Setup for 2024 Ford Maverick Hybrid

Hi Russ; you pretty much have everything you need right there with the exception of a few parts. I'm going to go ahead and list it all out here with links to make it easy for your to manage. You will need the following: -etrailer Invisible Base…

view full answer...

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...

Complete Flat Towing Setup for a 2025 Ford Ranger XLT 4X4

Hey Gary, yes, we do have a base plate for your 2025 Ford Ranger! What you'll want is the Roadmaster Direct-Connect Base Plate Kit #RM23DQ. This base plate has removable arms, has hidden brackets for a non-obtrusive design, and has a simple…

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...

Towing