Hopkins Plug-In Simple Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
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2020 Audi Q5
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2020 Audi Q5
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Wiring a trailer doesn’t have to mean splicing into factory wiring. The Hopkins Plug-In Simple Wiring Harness connects straight into the existing tow package port behind the rear bumper. It’s a direct plug-in, so setup takes just minutes with no wire tracing or cutting needed.
Once plugged in, this harness gives you a working 4-way flat trailer connector that powers your trailer’s running lights, turn signals, and brake lights. It’s exactly what you need for basic towing setups with small or midsize trailers.
The connection point sits behind the rear bumper on the driver’s side, keeping everything protected and out of sight. It uses the built-in factory port, so the finished install looks tidy and stays secure while towing.
Because it’s made for vehicles that already have a factory tow package, there’s no need for an external converter box or extra wiring. Just plug it in and you’re ready to connect your trailer and hit the road.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to be taking a look at the Hopkins Plug-In Simple Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector. This product fits certain years of the Lexus LX 470 and the RX 300, as well as the Toyota Highlander. You can use the vehicle fit guide located at etrailer.com to see if this is a fit for your vehicle. It's going to provide a 4-way flat connector at the back of your vehicle to power your trailer's signal lights. This harness is designed for use with the factory tow package. The 4-way flat connector is compatible with 5-pole, 6-pole, and 7-pole adapters.
If you're in need of one of those, they are sold separately, and available here at etrailer.com. Yeah, it's going to come with a dust cap for the 4-way flat connector. That way you can always coverup the connection points when your plug's not being used. Now this unit's designed to connect quickly and easily. All you got to do is locate the connection point behind the rear bumper and plugin your connector. This is custom fit, so it's going to match up perfectly with the plug on the vehicle.
It's going to snap lock together for a nice, tight, secure connection. Then you can secure any excess or slack in the wiring with the included cable ties. What's your instillation is complete, the 4-way connector is going to be stowed beneath the vehicle near the trailer hitch. We do recommend using a mounting bracket to keep the connector secure. Mounting brackets are sold separately. It's recommended that you use a small amount of terminal grease on all your electrical connections, like the vehicle and the 4-pole connector itself.
This grease is designed to help prevent corrosion to the terminals, and it is included with the kit. That's going to do it for today's look at the Hopkins Plug-In Simple Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector.
Ratings & Reviews
Doesnt easy connect with FJ cruiser . I have to re wire and soder.
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Mike L.
12/26/2025
The part isn't a fit for an FJ Cruiser, it fits the 2001 - 2003 Toyota Highlander with factory 4-flat, the 2001 - 2007 Lexus LX 470 with factory 4-flat and the 2001 - 2003 Lexus RX 300 with factory 4-flat.