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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.
Features:
Specs:
Installation
This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the floor trim panels, access panels, and tail light assemblies to access this harness.
Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.
Once installation is complete, the 4-way flat connector will be stowed in your rear cargo area.
It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.
A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.
With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.
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Average Customer Rating: 4.9 out of 5 stars (25 Customer Reviews)
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.
Had my Volvo dealer install the harness when they installed the hitch. Everything seems to function well - no troubles at all no matter what the weather.
The kit fit well in a Volvo XC60. It's kind of strange that Volvo didn't provide more of a plug-in option, but this worked well. I'm very glad the battery was located in the trunk, because I would not have been excited about routing the battery wire all the way to the front.
This harness is almost perfect. One gripe is that the instructions say to install this on the drivers side rear compartment. I don't know why anyone would want to do that. The factory harness kit attaches on the passenger side, the gasket to pass wires through the body is on the passenger side, and there is a fuse box with 12V stud as a spare grounding stud for the factory trailer wiring. Installing it on the drivers side would require lengthening the trailer 4 pin wires and stringing a longer power back across the vehicle.
So I installed on the passenger side. My complaint with that is the yellow/brown wires going to the drivers side taillight is too short to reach across the vehicle, so I had to splice in a wire to extend it. Making the inline wires the same length as the passenger side would have made this a perfect wiring kit allowing install on either side of the vehicle.
Like the hitch, I referred to the Volvo hitch/wiring harness install for details on body removal, and existing wiring details. (Google Volvo Instruction No 31454723 for Part No 31439424).
When you remove the passenger side panel, there is a circuit breaker box and two factory connectors covered in a small bag. These are the connectors for the factory wiring harness module. If you add a breaker in the spare slot between the existing 40A and 20A breakers, this will provide power (always hot) to the Red/Brown wire on the 2 wire power connector. I terminated the black wire from the Tekonsha module with a spade crimp which fit right into the connector (could have cut off the factory connector and just spliced the wire, but decided against that). Taped and secured the connection to make sure it doesn't separate over time. I added a 20A fuse since that was the smallest amperage I could find at the auto parts store (factory module comes with a 40A fuse but the power plugs right into their module, and Tekonsha kit came with a 15A fuse).
I originally installed the 4 pin connector to the left of the hitch receiver. When I started to trim the bumper fascia, I realized the sensor to open the tailgate with your foot was in the way, so had to move it to the right side of the receiver.
Products didn't fit on my model. Was charged restocking fee and had to pay for return shipping
Easy installation on 2021 Volvo XC 90!!!! Works great with great instruction. Because hybrid did not link into internal electrical system.
Clear, easy to follow instructions. Good quality product.
Easy to Insall and all directions clear.
Awesome! Everything I needed and it fit like a glove. Very impressed.
Instructions were phenomenal. Kit was exactly as described. Very cool that they follow up a year later to see how things are working out, and happy to report that it has been a positive experience.
The order process was easy. Delivery was within a few days… fast! But, the best part was the easy to follow video instructions that allowed me to install the hitch in an hour. I haven’t done the wire harness yet, but if it’s like the hitch… it’ll be a breeeze. Thanks etrailer!!
This is an excellent product. Would definitely recommend to anyone. Makes installing very easy.
The light wire harness was a perfect fit and as always, the video guide made it easy to install.
Product was easy to install. The adaptor box gits nicely in the spare tire compartment, along with the connector. It was great for my occasional use of a trailer. A great pairing with the hitch for the bicycle rack
Perfect fit for my 2018 Volvo XC60. Getting access to the tail lights was the most difficult part. Installation took one hour. The instructions included show the battery in the engine compartment, but my vehicle has the battery in the spare tire compartment under the cargo area. No need to route the black 12 ga. power wire forward under the vehicle. Bonus! Tested the 4-Flat connector and good to go.
Great product, plug & play, & video's on line made it easy. Dealer was going to charge me $850 for what I did for $65 & less than an hour of my time. Great deal
Easy to install perfect fit works as advertised great system.
The product worked great
Trailer wiring kit has worked flawless for more than a year. I am very satisfied.
We did not install it ourselves and paid about $90 to have it done. It works well
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