Trailer Wiring Harness Installation - 2015 Mazda CX-5

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How to Install a Trailer Wiring Harness on a 2015 Mazda CX-5


Speaker 2: Today on our 2015 Mazda CX-5 you're going to be taking a look at, I'm going to show you how to install the Takata T-1 vehicle wiring harness with 4-pole flat trailer connector. Part number 118563. Speaker 1: So, this is what our wiring looks like when it's installed. As you can see when you're not using it, it's nicely tucked away. When you're ready to use it, pull it out, run it right over this rubber seam on your threshold. You want to make sure you stay away from any connection points, and you see we're going to have plenty of extra wire to get to our trailer.

It's going to give you all the proper functions, the running lights, brake lights, both turn signals, and your ground wire. It's also going to come with an attached dust cap. It's going to help keep the elements off of your metal connections to help keep them from corroding.To begin our installation we need to gain access into the back of the vehicle and we're going to remove a panel of flooring. You'll have a little push pin fasteners that hold it on up here. Just pop those out.

Go ahead and remove your styrofoam inserts.Next we're going to have a little push pin fastener here on the side on the ends that's going to hold your threshold in. We're going to remove those then we're going to want to remove our threshold. We're just going to pull up on it like this and move our way across just like that. Then they have another push pin here and you'll have another one on the other side.We'll just take a trunk panel tool and pry it like that, then do the same thing on the other one.We'll take a 10 mm socket, we're going to remove this hook right here. You're going to have the same thing on the other side, you're going to remove that one also.Next we want to remove this little panel to give us access to the back of the lights, then you're going to have the same thing on the other side, you're going to want to remove that one also.

Take the trunk panel tool, we'll just pry out like that. You have a little tab on this one and this one you just push up on the inside.What we want to look for is these two gray wires right here with great connection points. We're going to take the wiring, you want the red and the brown and the yellow and the white. We're going to go up behind the panel. So, now we're going to unplug the lights.

You're just going to push in on that gray tab right there and pull out. And we're just going to match our ends, push it in until you hear it click. Same thing with that one and they're going to be different so, you can only put them one way, and you're going to take the other end and plug it back into the taillight, just like that. Now we can put our panel back in place.So, next thing we want to do is we're going to pull our wires right out the side of our panel here real quick. Your green wire is going to route right here underneath this panel and up to the passenger side. So we'll lay that like that.So, next thing you'll notice is there's two grommets right down there on the floor. We're going to need to run our power wire up to our battery, but we need to go outside of the vehicle. So, I think what I'm going to do is I'm going to use this smallest one right here, I'm going to take a trim panel tool or if you have a screwdriver you can use that and pop this out. Then what I'm going to do is I'm going to put a little slice in it so I can run my wire through there.Next thing I'm going to do, rather than taking the whole bundle of wire and trying to push it through that hole, I'm going to take an airline tube and push it right up on this grommet like this, go about half way then I'll take this airline tube and I'll go down through this hole and out underneath the vehicle. I'm going to take my power wire that's running up to my battery, I'm going to take one end of it, I'm going to put it into the airline tube like this, then I'm going to pull the airline tube back up till I get my wire, push my grommet back into the hole, I'm going to strip the end of my power wire and I'm going to put it in the butt connector that's already on the wiring in the kit, crimp it down, then we're going to slowly pull the excess out. Then before you pull it all the way out, we need to find a place that's flat we can mount our converter box.Once you find your place, I'm going to take some rubbing alcohol, I'm just going to wipe it down. Now I'm going to take my box, plug it in, push until you hear it click, peel of the double sided tape here. Got to make sure you press it firmly in the place. Where my power wire's coming in through that grommet that I cut go ahead and put some silicone on it.Next thing we need to do, we need to mount our ground wire. It's always a good idea if you can find an existing screw that's already in the body to mount it on that. If not, your kit always comes with a self tapping screw to put it in. You just want to make sure it's in metal and it's in a clean place. We actually have found a bolt, right about here behind this panel that already has ground wires on it. So, we're going to take a 10 mm socket with a swivel head and we're going to remove that and that's where we're going to put our ground wire. Just like that. I'm just going to zip tie my wires right here on this factory wiring just to make sure if it ever gets pulled on it's not going to pull my modular box or any of my other wires that are running to my tail light in here.What we've found is your modular box is so thick that where we had it, back here on this back wall, you couldn't put your panel back in place, wouldn't go in all the way at the bottom. So, what I had to do is I had to pull it off and I zip tied it right over here to the side to this factory wiring.Now we can put our trim panel piece back in place. Want to make sure you pull out the weather stripping as you go. Replace our pushpin fastener. Put, and hold it back in place here.Next thing I'm going to do is I'm going to run my green wire across here and I'm going to zip tie it along this factory wiring. And, we're going to do the same thing we did on the driver's side here on the passenger's side. We'll pull out our panel. That's when we look for these two connectors and you're going to want to match up the end on this side on your passenger side, you're only going to have one connection to make. This one is going to be the middle one. So, we're going to go ahead and unplug that one. You want to take your green wire, we're going to feed it up behind our panel and then we're just going to match connections, then the other end is going to go back into the taillight, and then you can tuck the rest of this back in then put our panel back in place.Now we can replace our threshold. Just going to push down then again you're going to have two plastic push pin fasteners, one on each side that you need to put it back in. Start putting all of our pieces back in to our hatch.Now I'm going to run my power wire to the front of the vehicle, to the battery. So, let me get that done real quick and I'll show you how I did it. As you can see we're coming out of our grommet. I ran it right across over the top of all this. Now we're here about a rod that runs across here. What I did, is I ran it right through this frame or crossbeam. Then you have a big plastic panel that runs across the whole bottom of the vehicle to the front. It's going to have all the existing wiring in it. What I did is I just followed the edge all the way up. Run it behind all this back to this existing hard line right here. And you can see I have an airline tube that I ran down from the battery side. We'll put my wiring into the end of the airline tube, go up top, pull the airline tube up, my wire will follow.We're going to be connecting this to the positive side of our battery. I'm going to cut it about right here, I'm going to strip the end and I'm going to replace the butt connector that comes in your kit with a heat-shrink butt connector which you can find on our website if you don't have any, just because it's going to be a little bit outside of the vehicle so need a little bit of extra protection. Crimp that down. You're going to take your fuse holder, you're going to cut it in half. We're going to strip both ends. One end we're going to put the ring terminal that comes in your kit. The other end is going to go into our heat-shrink butt connector. Then we're going to take a heat source. I'm going to use a heat gun, and you want to make sure that you're not pointing at anything that's going to melt or burn other than the heat-shrink butt connector.Next I'm going to take some electrical tape, I'm going to cover up the butt connector, just to give it a little added protection. I'm going to take a zip tie and we'll zip tie our wire right here just so it doesn't fall back down underneath the vehicle at all and we don't have any slack down there.Next we'll remove this nut here. You use a 12 mm socket. You want to make sure when you make this connection your fuse is not in the holder. Once you've made your connection you can put your fuse in.Now we'll test out our wiring using part number I26. Left blinker. Right blinker. Brakes. Running lights. Speaker 2: That'll do it for looking at an installation of a Takata T-One vehicle wiring harness with 4-pole flat trailer connector, part number 118563 on our 2015 Mazda CX-5.


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Test Fit:
Joe V
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Test Fit:
Shane H
Video by:
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