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

Video Transcript for Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118701 Review

Today we're going to look at the T1 Vehicle Wiring Harness with the 4-Way Flat Trailer Connector. This is a custom fit part, it is designed to fit the 2016 and newer Toyota Prius vehicles, and on a custom fit part I always like to recommend for you to go to our website, use our fit guide, put in your year and model vehicle and it'll show if this work for your application. Now this will again provide a nice 4-way flat trailer connector at the back of your vehicle to power your trailer's signal light. This will be compatible with 5-Pole, 6-Pole, and 7-Pole adapters that we sell separately. All this harness will connect quickly and easily. Basically just locate your connection points that are in the rear cargo area behind the taillight, plug in these two connectors, one on the driver's side, one on the passenger side, and then you have this remaining red T-connector here matched, and you'll run this underneath the vehicle on the driver's side, and match it to the T-connector on the vehicle, that is usually toward the rear of the taillight assembly, just plug it in right there. And then you'll want to ground the white wire, and then the black wire is your power wire, that will run to your vehicle's battery. Now this harness does include the module light here, this black box.

This is a power converter to ensure that your vehicle's wiring will match that of your trailer, and the power module will connect directly to your battery to avoid overloading the vehicle's electrical system. Now the wire that they run off the back with the 4-way attachment that plugs into your trailer, that wire is a 16-gauge bonded wire. If you notice on the 4-way, this does come with an integrated dust cover for the 4-way, so when it's not being used you can just put that cover over to protect the terminals from any damage or from the elements. A few specs on this harness. The maximum amperage is for the stop and turn light circuits is 4.2 amps per circuit, and for the taillight circuit is 7.5 amps. Now this part comes with everything shown here on the table, and again just briefly to go through how this would install, now they do give you a nice set of detailed instructions that'll describe how to install it, with pictures on where your connections are made. Basically again, you'll just go to the rear of the vehicle, the rear cargo area behind the taillights, and you want to start with the driver's side which is the T-connector has the yellow wire in it. What you do is go ahead and unplug the wire harness behind the taillights, plug this in to the harness in the taillight.

Then you'll take your other T-connector that has the green wire, that's the passenger side, you'll run that all the way over to the passenger side, plug that in right behind the taillights. Now the converter box, you don't want it bouncing around, so they do have a mounting hole right here if you want to attach a screw to hold it down. They also give you a nice piece of double face tape that you can use. And again you'll run this bonded wire out the back towards the trailer, and again the last connector is this length of red wire. Again, this will plug in to the matching connector on your vehicle, and that connector will be located underneath the vehicle on the driver's side, toward the rear of the taillight assembly. Once you find it that matches that, go ahead and plug that in. With the connectors all connected and the 4-way out the back, you have two remaining wires.

The white wire with the eyelet on it is the ground, you want to connect that to a good, clean ground. If there's one nearby you can use it, if not, they do give you a grounding screw that you can make your own. And then the remaining one is the black wire, that's your power wire, this is what'll run to your vehicle's battery, so they give you this extra length of wire to run that, and they give you these heat-sealed butt connectors, so you put one on there, one on the end of the length of wire, make your connection, run this all the way up to the front where the battery is. Now once you get up there, you don't want to connect this directly to the battery, you want to run it through the inline fuse holder right here. So what you'll do is take the other butt connector, connect it to one end of the inline fuse holder, and then on the other end of this fuse holder, you'll take this eyelet connector, and this is what'll connect to the battery. Once you get that all connected, just pop it open, take the included 15 amp fuse, line it up with the fuse holder, push it in, put your cap on there, and your system will be all ready to go. Now if you notice they do give you some extra cable ties that'll take up any slack in the wiring.

The large one they even give you, if you want to attach your power converter here with the cable tie either way. That should do it for the review on the T1 Vehicle Wiring Harness with the 4-Way Flat Trailer Connector.