Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Chevrolet Blazer

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2019 Chevrolet Blazer


Hi there Blazer owners. Today, in your 2019 Chevrolet Blazer, we're going to be taking a look at and showing you how to install Tekonsha's T-One 7-Pole Vehicle Wiring Harness. This is what our wiring looks like when it's installed. That's right, it looks like it's just a factory old vehicle here, but if we remove our panel here at the bottom, by spinning the screws at the bottom counter-clockwise, we've got our receiver hidden behind it, as well as our 7-pole connector, conveniently hidden behind the panel here as well. This custom fit 7-pole wiring from Tekonsha is going to provide you with a standard 7-pole here at the back of the vehicle with all the outputs fully functioning, which will include all of your necessary lighting signals, such as your left turn signal, right turn signal, tail lamps, and brake lamps, your auxiliary lighting for your backup lights, as well as a charge line, your auxiliary power circuit. It does have outfits for a brake controller as well.

If you'd like to, you will need to install a brake controller to make that fully functional, but it is pre-wired on the inside for that circuit.Included with this wiring kit, you are going to receive the 7-pole connector, as well as the harness that is custom fit for your vehicle that plugs directly into your factory connectors located right here behind the bumper. You will need to purchase mounting options for it as brackets to get it mounted up don't come included, but we've got plenty of different options here at etrailer.com. If you'd like the way we've got it set it up here, we we're using a short bracket as well as a 7-pole bracket from Pollock. With the wiring harness being custom fit, the installation couldn't be any easier. Why don't you follow along with me, and it'll be over before you even know it.We'll begin our installation underneath the vehicle by finding our factory connectors.

You can see a little bit easier, get some more light in there if you remove your cover here. There's two twists pins here at the bottom. We're going to turn them counter clockwise and we can just pull our panel off. Your hitch is going to be mounted behind this cover as well as a location to mount your wiring. We're using both a short bracket, which is a no drill bracket that clamps around our hitch, and a 7-pole bracket, which attaches to the no-drill bracket.

Now we did modify these by bending them in a way to where we can easily access our connector. You just need to hold it up there and you can see, I kind of put about a 45 on this piece right here to see where it's going to work out best. Go ahead and get those clamps on, that'll be a little bit easier if you've got those in position.We're now just on the other side of our opening that we pulled off the cover there. Towards the driver's side, you'll have two connectors here that we want to pull down. Each of these connectors, we're going to be putting our new wiring into.

We can just pop those out. This connector here, the larger one, is likely not going to be in this upper location next to this one, when you get here, unless you have not had a hitch installed. If you're putting your own hitch on, you're probably going to find it clipped in a little bit lower down here, but it has to get relocated when putting this particular hitch up. We'll just pull this guy off of there. It can be a little stubborn sometimes, so you can just give it a little push on the backside. Once we've got it popped down, that'll make it easier to remove our dummy plug. We'll press in on the release tab here and just slide the dummy plug off.We're then just going to do the exact same thing on the 4-pole connector here. On our 4-pole, there is a red locking tab that you will need to push up away from the dummy plug in order to reveal the release tab. We can then just pull our dummy plug out of there. You'll have matching connectors on your new harness that will plug directly into your factory connector. We're just going to match up our smaller four pin connection here and click those two together. Make sure they click and then press the lock tab down. We're going to do the same thing with the larger connector here.We can now take the 7-pole connector that comes in our kit and mount it up into our bracket. The hardware for mounting your seven way connector is going to be included with the bracket that you purchased, it does not come in your kit. You're just going to slide that hardware through and then secure it with a nut on the opposite side. Here on the backside of our 7-pole, we can take the other end of the harness that we had plugged into those factory connectors. We're going to run it around and line it up and click it into place with our factory seven way. One of the things you'll want to do when doing this is put some dielectric grease on the inside of your connector. We're not going to be doing it today, though, for demonstration purposes. If you need dielectric grease, you can pick up some here at etrailer.com. At this point, your wiring is fully installed. We can plug in a tester and test it out. You can zip tie up any loose wiring that you've got up there to make sure it stays nice and clean.We've now got our tester plugged in and we're going to make sure everything's working properly. I recommend you use a tester over your trailer to ensure that your vehicle's working properly in the event that there's something wrong with your trailer. You'll notice right away that we've got a light on here and that's our 12 volt charged circuit and that's working properly. You also want to make sure that you have your left turn signal, right turn signal, tail lamps, brake lamps, and reverse lamps. The last circuit on our 7-pole is for a brake controller, which we don't have installed today. With everything working properly, you can either load up your trailer and hit the road, or if you're not going to use it right now, we can put our cover back in place, as our connector will stay completely hidden behind it until we're ready to use it.That completes our installation of Tekonsha's T-One 7-Pole Vehicle Wiring Harness on our 2019 Chevrolet Blazer.


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Info for this part was:

Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F

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