Trailer Wiring Harness Installation - 2017 Honda Pilot

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How to Install a Trailer Wiring Harness on a 2017 Honda Pilot


Today on our 2017 Honda Pilot we will be having a look at and installing the Tekonsha T1 Vehicle Wiring Harness with Upgraded Circuit Protected Module Light with 4 Way Flat Wiring, part number 118679. All right, here's what our trailer wiring looks like once it's installed. As you can see, it's designed to be stored outside of our vehicle, making it readily accessible for when we want to hook up to our trailer. When we're not using it, we can store it around the safety chain loops on our hitch. This will keep it up and out of the way from dragging on the ground, and help protect it. This trailer wiring harness here gives us the basic functions as required by law in order for us to safely tow a trailer. Our white wire gives us our ground.

Our brown wire gives us our taillight and running light signal. Our yellow wire is our left turn signal and left brake light, and our green wire is our right turn signal and right brake light. We have 4.2 amps of power output for our turn signals and our brake lights on each circuit, and 7.5 amps worth of power output for our taillights and running lights. If we have a trailer that's old and has several incandescent light bulbs on it, we shouldn't have any problem hooking up to and being able to power all the lights. If we have a trailer that has many LED lights on it, we have no worries, because LED lights draw less power than incandescent lights. One other nice feature about this wiring harness is that we have this black loom here to help cover up any of the color wires so we don't have to see them dangling below our vehicle, giving us a nice clean look.

What I really like about this wiring harness compared to other ones on the market, is that it has a built in grommet installed on it, so we don't have to worry about poking a hole in the existing factory grommet in order to pass the wires through to the outside of the vehicle. Now that we've gone over some features, we'll show you how to get it installed. All right, to begin our installation we'll have our rear hatch open. We'll take off our cover here for our cargo compartment, slide that forward. Now our cargo compartment, we'll just lift up on this front section, slide that out of the way. We'll do the same to the back one, too.

Now our cargo hook right here, we use a flathead screwdriver to pop it open, and it'll hang down by this strap. We'll find an 8 millimeter bolt on the inside and we'll remove the cargo hook. Okay, our bottom cargo hook, we'll fold it down. We'll use our screwdriver again. It's a little difficult to get in there, but once you have it popped loose it'll fold down and you'll find a Philips screw on the inside. Now, this cover right here below our power outlet, take our flathead, pop it open.

We'll remove it. This'll give us a little bit more vision later. Now we'll grab our weather stripping here and we'll just pull it back a little bit. Now we'll grab our black section of plastic and pull back. This white connector right here behind our trim panel underneath our seatbelt mechanism, that is where we'll be plugging our harness into. Okay, now that we've identified where our connector is, we'll take our 4 pole flat connector and we'll plug it into the factory tow package wiring. Go through this hole here. Okay, it only goes in one way, it's keyed. Once you have it in, push on it until it clicks, and it's secure. Now with this particular wiring harness, the wiring is designed to live outside the vehicle, and we have a new grommet right here in order to pass it through our vehicle. We need to locate where the existing grommet is and remove it. It's going to behind this cover here where our jack is stored, so we'll just go ahead and pop this cover off, and it's located right here. Right behind the styrofoam cutout for our jack support, we can see where our grommet is. We'll grab the grommet, push it on out. Now we'll just take our 4 pole flat, stick it in the square hole, route it behind this panel, and then push it through the grommet hole, reach it through the vehicle, pull the wiring on down. Now we'll just pull our grommet down until it locks into place in this hole, just like that. Now we need to mount our module light box. We're just going to use the double sided tape that's provided with the kit, and we'll stick it right here in this area here. Our double sided tape, peel off one side, stick it on the module on the flat side, not the curved side. Press down on it nice and firm, peel back the other side, stick it into place. Now our ground wire here, we need to attach directly to our vehicle's sheet metal. We can use the provided self tapping screw or alternatively, there's an 8 millimeter bolt right here that we can remove and use that to hold our ground in place. That way we don't have to drill any holes in our vehicle. Okay, that'll give us a nice solid ground, and no new holes in our vehicle. With all of our connections made, we can now reinstall all of our interior panels. We went ahead and bundled up the rest of our excess wiring for our trailer connector underneath the vehicle, secured it to a wiring harness here for our reverse lights, secured it to the hitch with a zip tie here, and then we used the built on dust cover here to secure our wiring to our safety chain loops on our hitch. This'll keep it readily accessible for when we need it, and prevent it from dragging on the ground. Now we're underneath the hood of the vehicle. We have a fuse box right here next to our master cylinder. We'll remove this by pressing in on the three tabs, pulling it out of the way. We have an empty spot right here where we will be able to install our provided 30 amp fuse. Just push that on in there like so. Okay, with our fuse installed we'll now reinstall our cover. All right, now when we test our wiring, we're using a 4 pole flat trailer tester. We have these available on our website as part number I26 if you'd like to purchase one. We'll start by turning on our headlights. Do a left turn signal now. Try our right. Now we'll step on the brakes. You can see our brake lights are working. Now we'll do turn signals with our brakes on to make sure that everything's functioning properly. That completes our look at and installation of the Tekonsha T1 Vehicle Wiring Harness with Upgraded Circuit Protected Module Light with a 4 Way Flat Trailer Connector, part number 118679 on our 2017 Honda Pilot.


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