T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Video Transcript for Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118721 Review

Today, we're going to be taking a look at a T-One vehicle wiring harness with a 4-pole flat trailer connector. This product fits certain years and models of the Volkswagen Passat. To see if this is a fit for your vehicle, you can use the vehicle fit guide located at etrailer.com. The unit's going to provide a 4-way flat connector at the back of your vehicle to power your trailer's signal lights. This is compatible with 5-pole, 6-pole and 7-pole adapters. Your adapters are sold separately.

It's also going to come with a dust cap for the 4-way flat connector. One of the things that makes this harness a little bit different than others is that the dust cap is actually tethered to the housing. That way it's always connected. You don't have to worry about misplacing that or losing that but that cap basically just goes over the connection points and keeps them protected when the plug's not being used. The black box on the unit, this is the included module light. This is a power converter that ensures that your vehicle's wiring matches that of your trailer's so the power module connects directly to the vehicle battery through the wiring which is going to avoid overloading the vehicle's electrical system. The unit is designed to connect quickly and easily.

All you have to do is locate the connection points in the rear cargo area and plug in your T connectors. These connectors are custom fit for your vehicle. They're going to match up perfectly with the ports on the vehicle and they're going to snap off together for a nice, tight, secure fit. The connector with the green wire goes to the passenger side of the vehicle. The connector with the yellow wiring goes to the driver's side of the vehicle. Once you get those connected, you'll need to make a ground connection.

That's going to be your white wire with the ring terminal already attached to it. You want to get that grounded to a nice, clean metal surface with the included grounding screw. Then, you'll need to mount the converter box to a nice, clean, out of the way location with the included double-sided adhesive foam tape. Once you have all that done, you're going to need to run the hot lead to the vehicle battery. The hot lead is the short, black wire that comes out of the converter box. This is going to get connected to the bundle of black wire with one of the included butt connectors.

The other end of the bundle runs to the vehicle battery and gets connected to one-half of the fuse holder with another butt connector. The other half of the fuse holder gets a ring terminal attached to it and gets connected to the positive post of the vehicle battery. It does come with your 15 amp fuse, goes directly in here. It's got the fuse cap that goes over it to keep it safe and protected. Once you have that done, you can go and secure any wires that you have with the included cable ties. What I mean by that is you want to secure any excess or slack in the wiring. You want to make sure your wires are up and out of the way and safely protected. We do recommend that once the installation's complete, that the the 4-way connector is stowed in your rear cargo area. There'a plenty of wiring so that way, you can pull it out of the back of the vehicle when you want to use it. When you don't want to use it or when it's not being used, you can bundle it back up and put it back in the rear cargo area. That way it's out of the way and it's protected from the elements. It's also recommended that you use a small amount of dielectric grease on all your electrical connections like the plugs on the vehicle and the 4-pole protector itself. That's going to protect the connection points from any type of corrosion. You can find that grease here at etrailer.com and is sold separately. When it comes to the maximum amperage for the stop and turns lights, we're looking at 4.2 amps per circuit. For the tail lights, we're looking at 7.5 amps per circuit. I also want to mention that this comes with detailed installation instructions to help walk you through the entire process step by step. That's going to do it for today's look at the T-One vehicle wiring harness with a 4-pole flat trailer connector.