Tekonsha T-One Vehicle Wiring Harness Installation - 2020 Chevrolet Blazer

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How to Install a Tekonsha T-One Vehicle Wiring Harness on a 2020 Chevrolet Blazer


Connor: Hey guys, this is Connor here at etrailer.com, and today we're going to be looking at how to install our Tekonsha T-one vehicle wiring harness on our 2020 Chevy Blazer. The Tekonsha T-one vehicle wiring harness is an excellent option for this vehicle. It offers a complete plug and play installation and it's going to provide us with our basic trailer lighting functions, such as the stop, the turn signals, and the running lights. The Tekonsha T-one vehicle wiring harness has four pins here. These four pins are for the basic trailer lighting functions, which is going to be our most common trailer connector. Some trailers with trailer brakes are going to have a seventh hole, and there's also another harness for that if we need it.The Tekonsha T-one vehicle wiring harness is going to be secured here on the outside of the vehicle.

Now, we have two options for this. The first option being we can use the included dust cap and we could simply loop it through the safety chain loops here. We can plug this over the pins, and that's going to prevent dirt from getting in there, or water and causing corrosion issues. Now, the other option we have is to buy a no drill mounting bracket, which can be obtained from etrailer.com, and we can use that to secure it to the actual trailer hitch body. This is going to be a little bit more secure installation, but again, there's no drilling or cutting required.The wiring harness for our Chevy Blazer here offers complete plug and play installation.

In order to do this, we just need to find the tow package port, which is behind the rear bumper here on the driver's side. Let's go ahead and show you how this is done. To start our install today, we're going to first want to remove this rear center knockout panel. Now, in order to do this, there's going to be two tabs at the bottom. We're going to give those a twist.

That's going to free up the bottom portion of this panel, and there's going to be a couple more tabs at the top. We're going to want to pull down with a little bit of force here, and then we can set this aside in a safe place.Once we have our center knockout panel removed, we're going to go ahead to the back of the vehicle here and find our tow package port. This is going to be located behind the rear bumper on the driver's side. It is a square connector with four green rubber plugs at the end. Once we find this, there is a red tab on the outside.

We're going to need to push that away from the vehicle. Then once we push that away, directly in front of that, there is going to be a tab we need to depress. Now, in order to remove the plug, we're going to push back on this red cap away from the vehicle. And in front of us, we're going to depress this little tab here, and that should then allow us to pull the plug off.Now we can get our wiring harness and install it. We're going to grab our harness here and we're going to see the interior. There's four pins, and this is going to match the plug on the vehicle. We have our harness here, and we're going to see the matching plug on the vehicle side. So we're going to go ahead and make these two connectors together. We're going to push all the way in, and you should hear sort of a click. See, we hear the click there. And then we're going to take our red tab at the back and we're going to push that in to lock it in place. And just to make sure it's secure, we're going to give a little tug here on the actual connector.Now that we have the plugs mated up, we see we have some excess wire here. Now, we don't want this dragging the ground, so what we're going to do is we're going to coil this up here, give a good loop, and then we see here there's an existing wiring harness under the bumper. So what I recommend doing is taking the plug, coming over the hitch here, and then tying up your extra wire and securing it to the wiring harness already here behind the bumper. Then we can take our plug here with the dust cap, loop it through the safety chain hook, and then we can plug our dust cap in. So now our wiring harness is going to be secure, and it'll be right here when we need it for towing.The final step of our installation process is going to be to test our wiring to make sure our lights work. In order to do this, we can get a test light etrailer.com. And if we have a friend nearby, we can have them get in the vehicle and activate the signals while we're here at the rear testing them. Here we see the routing line is working. That will be our right hand turn signal, that is our left hand turn signal, and then we have the brake lights. Now, if any of these lights did not illuminate, we'd want to check our owner's manual to make sure all the correct fuses are inserted.Now that we have our plugs mated up, we have our wiring harness secure, and we've tested all our trailer lights, that's going to do it for today's installation of the Tekonsha T-one vehicle wiring harness for a 2020 Chevy Blazer.


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Info for this part was:

Employee Andrew K
Video by:
Andrew K
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F

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