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Tekonsha T-One Vehicle Wiring Harness Installation - 2021 Honda Pilot

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2021 Honda Pilot

Hey everyone Shane here with Today I have a 2021 Honda Pilot. I'm gonna walk through how to install the Tekonsha T1 vehicle wiring harness. This is gonna be a 4-pole wiring harness. So it's gonna give you the proper lighting functions that you're gonna need to be legal and safe when you're towing a trailer, brake lights, turn signals and running lights. It's what our 4-pole is gonna look like when it's installed. Now, the brackets that it's mounted on, do not come with a wiring harness, but you can find them here at etrailer.

As I mentioned is gonna give us our 4-pole connection. It's also gonna come with an attached dust cap, so when we're not plugged up to a trailer wiring we can throw on our dust cap and it keeps any dirt debris and moisture from getting inside there. The nice thing about this wiring harness it's gonna be plug and play. We're not gonna have any splicing to do. We locate the plug behind the inside panel on our driver's side.

And we just plug the two together or router wire outside the vehicle we're not gonna have to do any cutting because those are grounded in there that we we're able to run that 4-pole wire out of. It's gonna give us 4.2 amps per circuit for our stop and turn signals, 7.5 amps per circuit for our tail lights. This kits also gonna come with a converter box it's pre-attached to the wires. So what the converter box does is, when you're hooked up to a trailer if there's a wiring issue on the trailer where, it could potentially send backfeed to the vehicle that converter box is gonna protect the factory wiring on the vehicle from that backfeed. So when that backfeed hits the converter box, converter box is gonna cut it off and it's not gonna allow it to go into the vehicle to cause any damage to any factory wiring.

All the wire that's coming outside of the vehicle is gonna be covered with wire loom. So that's some extra we don't have to put on later on. This wiring harness is also gonna be compatible with five, six, and seven pole adapters which you can find here at etrailer. Now that we've gone over some of the features, let's walk through how to get it installed. To start our installation we're gonna start in the back of the vehicle you're gonna remove this back cover.

We're gonna come over here on the driver's side, this panel here, we're gonna pop it out and we're gonna set it to this side. This panel here, we're gonna pop it out and set it to the side. What we're gonna do we're gonna take a small flathead screwdriver or a pick. This is a cover and there's a nut or bolt right underneath. Right up through the bottom there's a little slot that you can put that in and get it up in there, that way you don't scratch the outside. We'll just pop that cover loose. We'll take an eight millimeter socket, remove the bolt. And we're gonna pop this out of place. You can just pull on it, pop it out come right down here to this hook. You're gonna fold that down and there's a ring, that kinda goes on the inside here. You need to get a small screwdriver in there, or even you know pick if you have it we're gonna pop this out and there's gonna be a screw underneath it. So I'm having a little bit of trouble getting the screw out, it's in there pretty tight so I don't wanna strip it out. So what I'm gonna do is instead of working with that, possibly damaging it, what I'm gonna do is we're gonna remove this threshold panel. And I'm gonna start up here and pull this panel back enough where I can reach back 'cause our wiring sits back in here. For our threshold we can either take a trim panel tool and stick it under the edge. If you're right here in the middle, there's a little slot we're gonna pull it out enough where we can get under it. And we're just gonna pop this off, like that we'll set it aside. Now, what I'm gonna do is I'm gonna get a trim panel tool. We're gonna pull back this rubber seal and we're gonna get in between this panel and the body of the vehicle and we're gonna pop that out. There's a little clips that run along this edge that hold that in place. We're gonna start like this and we're just gonna work our way down, enough that we can reach back. So I know it's kind of hard to see back here. If you watch the tip of my screwdriver here, this plug right here is the one we need to get to. On our wiring harness we're gonna have two different plugs. If you have backup sensors you're gonna be using this plug as well as this one. This vehicle does not have backup sensors so we will not be installing this, we're just gonna be installing this one. So now what we need to do is we need to get back there, loosen up that wire so we can plug our new wiring harness into it. So I'm gonna take this plug and I'm gonna feed it down to this open spot down here on the side of the panel. Right there, and go ahead and pop this back in place if you want to, and take our wiring harness plug it in until it snaps, we're gonna take this plug and we're gonna go underneath, and feed it up right back here. And we can plug it into our vehicle. I'm gonna push it until it clicks. So before we mount our converter box and our ground wire, we're gonna remove this, this grommet right here. You can take a trim panel tool or a flathead screwdriver we're just gonna feed it under the edge. Then we're gonna pop that out, that. In your kit you're gonna get some two sided sticky tape. We'll peel off one side and we're gonna stick it to the back of our converter box. Peel off the other side and what we're gonna do is we're gonna stick it right up against this back panel here and then make sure the surface is flat. So you get a good hold on that two-sided tape. Put a little pressure on it, sure it's got a good hole. We're gonna take our 4-pole wire, this end, we're gonna feed it down through that hole where we removed that grommet. Our new wiring harness is gonna have a rubber ground to replace the grommet that we removed. It's gonna be pre-installed on the wire. So we'll just take that and push that down in the hole until we get it fully inserted. Next, you're gonna have a small cell tapper in your kit. We need to use that to ground our white wire. What I'm gonna do is I'm gonna ground it right here and make sure it's clean metal. What I'll do is I'll pre drill it first, take our white wire. Next we can go ahead and re-install anything that we removed our panel here, the eight millimeter bolt here and then your cover for your spare tire kit. And then of course, don't forget about your rear threshold. Last thing we're gonna do is we're gonna come up on earth hood to our fuse panel. We're gonna push these in, we're gonna pop this off or flip it over. And it might be kind of hard to see, but there's a legend printed on the inside. We're gonna have three fuse we need to install. One is gonna be trailer main, which on your legend is gonna be the center row all the way at the end, which is gonna be here. We're gonna do the trailer e brake, which there's a 7.5 amp fuse. We're gonna go to the slot right next to it, and between the 30 amp and that 7.5, we're gonna install one of these small 20 amp fuses. And we need to install one to trailer charge which is gonna be the very end slot of another 20 amp fuse. Once you get those installed, put your cover back on and then we can test it up. Now we'll test out our wiring using part number 126. You can find 126 here at etrailer. Another way you can test it just by hooking it straight up to your trailer. Left turn, right turn, brakes, running lights. Now you've tested it out we can go ahead and get our wiring set up in the back of the vehicle. We have two options, we can run it behind our brace, which is right behind our bumper fascia. We can either use our dust cap to our hitch right here. Or if you wanted a more permanent mounting location you can use a no-drill long bracket and 4-pole bracket. These are not coming in the kit, you can find them here at etrailer. We're actually gonna be installing these, so we're gonna show you how to do that now. So this edge right here it's gonna go up over top of our hitch. The 4-pole bracket is supposed to mount like this but you can see, we don't have a whole lot of room here to do that because our hitch sits up a little high so what we're gonna have to do is about right here we're gonna bend this bracket so that this plate is sitting in this way. That way we can mount this 4-pole bracket out like this. Now with our bracket bent, we're gonna have a clamp. We're gonna feed our clamp over top of our hitch we're gonna take our bracket, we're gonna slide it up where the bracket is going over the top of it. We're gonna take one side and we're gonna come through the hole. I actually had to flip my clamp around so that I was able to tighten the bolt down on it. That makes it easier you can always take your spare tire down or loosen it. So you have a 516 socket and we're at tighten our clamp now. We can mount our 4-pole just like that. Both kits are gonna come or both brackets are gonna come with mounting hardware. And then we'll put a nut on the top side. So once I got this mounted, what happened was it was facing out like this because of the way our hitch is designed. I didn't necessarily like it that way, it's really up to you if you wanna do it. But I ended up getting it straight. What I did is I took channel locks on the side of my long bracket. I just twisted the bracket enough to where it's sitting straight. And when you do that this side may drop a little bit on this bottom side take the channel locks and put them in here, you can straighten that out. From here what we can do is we can run our 4-pole over, and get it attached onto our bracket. There's a brace, there's one here and there's one on this side that run that hold your fascia up to the by the vehicle. If you just run that wire right up behind it, we'll take our 4-pole and we'll just feed it into wreck it like that, and then install your dust cover and we can come back and we can straighten up all of our wiring. So all I did with my extra wiring is I bumbled it up and zip tied it right to that brace that I was talking about for the rear fascia. Once you've got everything molded up, everything's connected you have your wiring in place, you're ready to go. It's gonna do it for a look at an installation on the Tekonsha vehicle wiring harness on 2021 on the Pilot..

Aaron C.


This was an awesome video and it helped me a great deal. However, my Pilot DOES have backup sensors, and looked around for while to figure out how to use the plug for backup sensor, and couldn't figure it there a how to or video you can point me to to figure it out?

Les D.


You can disregard my comment about "behind bumper" as I misunderstood what a technician was telling me about the sensors. Please review the attached video. You will see that the multi-wire connector attaches behind the interior body panel at the back of the vehicle on the drivers side. Once that is connected, the single-wire connector is limited to about 16 inches of movement, so the connector must be nearby. I am now told that the connector is further up and further back than the multi-wire connector. I hope this will resolve your inquiry. Please let me know how this worked out.

Aaron C.


@LesD Hi Les, thanks for your reply, but neither of those video links work.

Aaron C.


@LesD ignore that. not sure why it didn't come up the first time, but it did come up.
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Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
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Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee Ryan G
Test Fit:
Ryan G
Employee Jonathan Y
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Jonathan Y
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