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Trailer Wiring Harness Installation - 2013 BMW X5

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How to Install a Trailer Wiring Harness on a 2013 BMW X5


Today in our 2013 BMW X5 we'll be installing the ZCI Circuit Protected Vehicle Wiring Harness for a 4-pole flat trailer connector. Part #119250KIT. When it comes time to hook up to our trailer, all you have to do, pull out our panel here, grab our trailer wiring, we'll hang it down here out of the way of our hatch. You can close your panel back up here. We'll close our hatch. Just like that we can hook up our trailer and have all functioning lights on it so we can safely tow. Here's what our kit consists of. We have our actual module here.

The parts that clamp over the wires, there is no quick splice that goes on the wire at all. This just goes over it and it picks up the signal from conductance. It's a really nice kit. The reason you want this kit over anything else is because you don't have to tap into your vehicle's factory wiring at all. It leaves it uncut, unharmed, and if you want to go back to stock it's very easy to do.

You just take it out and you can never even tell it was installed. This will work on a lot of your higher end cars where you don't have a wiring harness readily available for it. Or if you have an older car where the only wiring harness available for it is one where you'd have to splice into your wiring. You don't have to do that. This will work on any make and model of vehicle. We have our fuse holder here and a ring terminal. Some wiring, plus our fuse.

This will make our direct power connection to our battery. We have a handful of zip ties here so we can clearly route all of out wiring. We have some foam padding here. Also some double sided tape to secure our module box. Now that we've gone over what's included in our kit, we'll go ahead and show you how to install it. We'll begin our installation by opening our hatch, fold down the tailgate, there's normally a cover.

This cover here normally resides right here. We need to gain access to our battery, which is right here. There's a total of 1,2,3,4,5 screws that we need to remove. Set the screws down in there so we don't lose them. Lift this us, set it down in there. Now we need to gain access to our taillights. To do that we'll just grab these covers here on either side. Pull them out towards us. We'll set them aside. Normally there's a tab on the bottom. Push up on it. Pull out. Now we need to peel back this electrical tape. It's kind of a fabric material so we have some room to work with on our wires. That's probably enough right there actually. Now we'll turn on our taillights and find out which wire is our taillight signal. Okay with our taillights turned on and our circuit tester plugged in we're back probing it so we don't damage the connector. We can see this yellow and black wire is our taillight signal. We'll turn our headlights off real quick and we'll make your connection. With our headlights off we have verified that that circuits now dead. Now, we'll take our connector marked "Tail", we'll open it up like so. With this arrow pointing towards the end of our connector we'll lay our wire in here, in this groove and that groove. Then we'll close it up. The taillight again, is the black and yellow one. Here with that end there, we'll close lour connector down over it, just like so. Now we need to secure this with the included foam tape to keep it from moving. I'll wrap our foam tape around it just like so. Now we'll find out which wire is our left turn signal. The blue and green wire is our left turn signal. We're going to shut that off and make our connection. I'll take our on marked "Left Turn Signal" again, arrow facing towards the connector. Close it over that and we'll secure it again with our included foam tape. We can find out which wire is our break wire now. With the help of an assistant. With our assistant on the break pedal we'll find out which one the break wire is. On the break Off the break. On the break. Okay. So it's the black and yellow wire. We'll take our one labeled "Stop" and go over the black and yellow wire. Clamp it down over and secure it with the foam tape again. Now, we'll take our one for the right turn signal and we'll route underneath our plastic covering here. Up the other side like so. Now lift up this cover on the passenger's side and then unplug our light in the same manner. We'll peel back this cloth electrical tape again. Now we'll turn on our right turn signal and find out which wire is the signal wire for that. It's the blue and brown wire. We'll slide this on inside, close the cover on over it, then we'll secure it again with the foam tape. Now that we have all of our single wires covered up, we can make our ground and our power connection. There's a 8 millimeter screw right here. We're going to remove this and we'll attach our ground wire to that area. Take our included double sided tape here. We'll peel off one end, stick it to the back of our module, and peel off the other end. We'll stick our module down here underneath the plastic. This will keep all of our wires hidden once the panel is back in place. Now we can connect our power wire to our battery. We'll take about 6 inches or so of our supplied black power wire, cut it off. We'll strip both ends back, install our ring terminal on one end. Put a butt connector on the other end, crimp it down. Take our fuse holder, strip off a little more insulation. We'll install it to the other end of our butt connector. Crimp it down. Take the other end of our fuse holder, we'll strip off some more insulation. Install the last butt connector we have. We'll crimp it down. Then we'll connect this to the black wire off our control module once we strip off a little insulation. Now we'll use our heat gun and we'll shrink down both the yellow butt connectors. We'll route our wire under this panel, the same one we did with the wire going to the passenger's side. Right here is the plastic cover on the battery. Pop it open. Should be a 13 millimeter nut. We'll remove that and install our wire. We'll put that down to protect it. Now to install our 15 amp fuse in the fuse holder. Close the cover. Now we'll plug both our connectors back in to the taillights, either side. Now we can begin to program the unit. To begin our programming process we'll put our foot on the break and start the car. We'll hold our foot on the break for at least 5 seconds. Take our foot off the break, we'll turn our headlights on, again for 5 seconds. Turn the left turn signal on, for at least 5 seconds. Shut it off. Do the same for the right. Our unit should be programmed now. Let's go test it. We'll take a 4 pole flat trailer test that we have here. If you want to purchase one its part number I26 on our website. We'll install it and we'll turn our headlights on and see if we have taillight function. As you can see the light the corresponds to the brown wire, would be our taillight function on our trailer is illuminated. Let's start with the left turn signal now. Okay. We'll try the right now, which will correspond with the green wire. All right, perfect. Now I want to go ahead turn the turn signals off and step on the breaks. Both the lights that go to yellow and the green wires should come on solid at the same time. Now with that done I'll turn one of the turn signals on and step on the breaks and see if it still flashes. Turn the left one on so the yellow wire should flash and we'll step on the break and the green wire one should be solid. Perfect. That means our module box is programmed correctly and everything is working like it's supposed to. Now we can go ahead and put out trunk back together. We'll put our dust cover back over our trailer connector. We'll tuck our wire in the storage compartment so when we're not using it it's tucked up out of the way. We'll take our driver's side panel here, put it back in position, push it in place. Do the same for our passenger's side. Put our battery box lid, spare tire storage tools down here. Reinstall our screws. Tighten down our screws. I'll take this panel here, pop it back in place. Clip it down. Close our tailgate and that completes our installation of the ZCI circuit protection Wiring Harness with 4 pole flat trailer connector, part #119250KIT on our 2013 BMW X5.


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