Curt Powered Tail Light Converter Installation - 2010 BMW X3

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How to Install the Curt Powered Tail Light Converter on a 2010 BMW X3


Today on our 2010 BMW X3, we're gonna be taking a look at and showing you how to install the Curt Power Tail Light Converter with a four pull flat trailer connector.So here's what our wiring's gonna look like once we have it installed. It is designed to stay in the inside of the vehicle until we're ready to use it. It is gonna provide us the four pull flat trailer connectors, so we have all the required lights to get down the road safely. So whenever we're not using it, we can store our wire in the back hatch area here over by the driver's side. Just bundle it up, it'll store neatly right into this cargo net. The only one thing to keep in mind is when you do go to use it, you can drop it just about anywhere out of the hatch, so long as you stay away from the latch mechanism itself.

That will damage the wire, but the weather stripping here is thick enough that it provides enough cushion that it's not gonna damage it.Our wiring harness has a powered tail light converter. What that's gonna do is it's gonna take the signal from our BMW and turn it into a working signal so that we can use it for our trailer. But it's also gonna help protect our BMW's wiring. In case of worry problems like a surge or back feeding from our trailer, it's gonna make sure that it doesn't damage our BMW. To begin our installation, we're gonna open up the rear hatch and we wanna remove the floor covering here in the center.

So we pull it out and we can set it aside.So on either side, we're gonna have this trim piece that we're gonna have to take out so that we can access the wires for our tail lights. You're gonna wanna come to the top, push down, and pull out and that'll release that clip up here, then we can pull the rest of the panel out. We're gonna do that for both sides. Then we'll have that liner that's gonna be right here. We wanna pull that away so we can get access to the tail light wires.

We'll just fold it out of the way for now, and you see we'll have this bundle of wires here. That's gonna go directly into our tail light. We're gonna need to test each one of these wires to figure out what the functions are. So we're gonna go ahead and turn our headlights on and isolate that function.So it looks like our tail light signal wire is going to be this grayish purple wire with a purple tracer on it. Now, we're gonna turn our tail lights off, and we're gonna turn our left turn signal on and see which one of the wires is for that.

We found that the green wire with the blue tracer is gonna be our left turn signal. Now we'll turn our turn signal off, we'll get an extra set of hands and have them press on the break and see which one of our wires is gonna be our break signal. Our break wire on the left side is gonna be the black wire with the green tracer on it. Now, we need to test the right turn signal, but that's the only one we're gonna need to test on the right side.And on the right side, our turn signal wire is gonna be the blue wire with the brown tracer. Gonna grab some of our quick spices from our kit and start making our connections now that we have everything tested. If you look at our quick splice, we're gonna have two channels. On of them is gonna go all the way through, and one of them is gonna be blocked off. Want to slide our factory wire so that it goes all the way through, so when you take the wire from our harness and slide it into the other open end, wanna clip down on that metal piece so we can close it up. So we'll start with our tail light function. So we'll take the purple gray colored wire with the purple tracer, and we'll take our brown wire from our harness, we'll slide it into the other channel, and I'm gonna grab a pair of pliers and we'll squeeze that tab so it compresses all the way down, and then we're gonna take our cover, and we'll just go right over the top. We're gonna continue connecting the rest of the wires for each function.Gonna try our turn signal on the left hand side, if you remember, it's gonna be that blue wire with the green stripe on it. Now, finally, we're gonna hook up our break signal wire, and we'll use the red wire coming off of our harness to hook into that. Now, we're gonna have a couple more wires coming out of our harness. We're gonna have a black wire, a white wire with a ring terminal, and a green wire. Right now we're gonna focus on our black wire, this is gonna be where we're getting our power from. So, I'm gonna take one of the buck connectors that they give us in our kit, slide it over the end of the black wire, I'm gonna crimp it in place, then we can take the length of 12 gauge wire they give us in our kit, we'll strip back the other end and put it into our buck connector.Now, our white wire, we have a couple different options of what we can do. We can take this included self-tapping screw, and screw our ring terminal into a flat spotted sheet metal, or we can find a factory bolt and use it as our ground. Now, if we come just the outside, we'll have a bolt right here that is going into metal. So I'm gonna take a 10 millimeter socket, pull that bolt out, slide the bolt through our ring terminal, then we'll reinstall it. Our green wire's gonna route over to the passenger side. We're gonna hook it up to the right turn signal, the same way we did with all the other ones on the left. Our black wire, we're gonna route it towards the center, right where our battery is.Now, in order to get our green wire over to the passenger side and the black wire to the battery, what we did was we actually routed it underneath and behind the phone here and just followed along the back of the threshold. There's some actually factory wires held in place down there, we just used a few zip ties to put them in place. Went behind all this, and we attached our green wire to our turn signal. Then with our power wire, we brought it over with the green wire, and we underneath this panel, following the wires, and we brought it over to the inside of the battery compartment. So we'll bring our black wire over to the positive posts in our battery, we'll remove the cover, we're gonna estimate about how much wire we're gonna need, and we can trim off the excess.We'll strip back the end of our wire, we're gonna grab another one of our buck connectors from our kit, we'll cramp it in place. On the other end of our buck connector, we're gonna grab our fuse holder, this is already gonna be pre-stripped, you just wanna pull the ends off. Slide our wire into the fuse holder and clamp it down. We're gonna grab one of the large ring terminals out of our kit, slide our wire over, and crimp it in place so we can make the connection at the battery. So we've got our 13 millimeter socket when you remove the nut, that's on the positive post. Slide a ring terminal over and replace the nut.Then we can take our 15 M fuse, put it into the fuse holder, and we'll put our cover back in place. Now one last thing we need to do is to mount our converter box. We're gonna actually mount ours on the bottom here right by our DVD navigation system. So I'm gonna take a little bit of rubbing alcohol, gonna clean the box off, as well as the spot that I'm gonna be mounting it at. We can take the double-sided tape that they give us in our kit, take the backing off one side, we'll press it directly on to the converter box, take the backing off the other side, and we'll stick it directly to the bottom of that platform. With everything hooked up, we can put all of the panels back in place and tidy up any wires that we may need.The final step of our installation is to make sure that our wiring is working properly, so I plugged in my four pull tester here, and if you need one you can pick one up here at Etrailer.com, so I'll go ahead and turn my tail lights on, we can see that that function's working properly. As well as my left turn signal, my right turn signal, and my breaks. That'll finish up your look at the Curt Power Tail Light Converter with four pull flat trailer connector, on our 2010 BMW X3.


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Info for this part was:

Video Edited:
Joshua S
Video Edited:
Jacob T
Video by:
Kathleen M
Video Edited:
Dustin K
Installed by:
Cole B
Video Edited:
Chris R
Video by:
Zach D
Test Fit:
Brent H
Test Fit:
Shane H
Video by:
Jonathan Y
Test Fit:
Robert C

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