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Curt 5th Wheel/Gooseneck Custom Wiring Harness Installation - 2022 GMC Sierra 2500

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How to Install the Curt 5th Wheel/Gooseneck Custom Wiring Harness on a 2022 GMC Sierra 2500


Hey everybody, Ryan here at etrailer. Today on our 2022 GMC Sierra 2500, we're gonna be showing you how to install the CURT In-Bed 7-way vehicle wiring harness. But before we do that, let's check it out and make sure that this is something that's gonna work for you. So the whole reason for an in-bed wiring harness like this one here is to give you a spot to easily hook up your 7-way wiring whenever you're pulling a gooseneck or 5th wheel trailer. And that's because those obviously connect inside of the bed here. And a lot of times, it's just gonna make it much more clean and easier to plug it in right here.

Not to mention, minimize losing your connection as opposed to taking your wiring from your trailer and draping it over your tailgate and running it all the way down to the bumper. So this is the right way to do things and really it does make it convenient. Not to mention, since this tees into the back of your factory connector on your bumper, you're gonna have two. So you're not going to lose the functionality of the one on the bumper. So if you a pulling around your utility trailer or something like that, both trailer, you're still gonna be able to plug right into your back bumper too and work.

So you're gonna have two that are functioning and you can use which one best suits your needs. So with this setup, it's pretty neat. I can't speak on every one of these trucks, but chances are pretty good. They're all gonna have this factory knockout. So there's this a dummy plastic plug that sits in there.

So you pull that out and then they give you this cover here. And it just fills that hole and utilizes that factory hole. It looks good, easy to get to and everything else. 'Cause if you have that there, it don't really make much sense to go drilling holes into your truck when you really don't need to. So I like the thought process behind that, utilizing what's already there and that really helps streamline things and just makes sense to me.

So this is gonna be the your classic 7-way round connector. Super common for just about every single gooseneck and 5th wheel out there. It's gonna have a catch on the bottom of the lid here to help prevent your wiring from getting pulled out on accident or anything like that. And it's gonna provide us with all those signals. So we're gonna have our turn signals, our running lights, our stoplights, our 12 volt auxiliary power, our trailer brake, or electric brakes, as well as our backup lights. So we're gonna be able to maintain all those functions and stay safe and legal. But other than that, a nice connector plug. It's well-built and it works. So you really can't ask too much more out of it. It's gonna have a seven foot harness, so pretty long, and that's more than enough wire to reach from here to your bumper. So that definitely helps make installation a little bit easier. You just have the wire you actually need to work with and you're not stretching it so thin that it makes it hard. So it really shouldn't give you any issues or take up a whole bunch of your time. But speaking of that, why don't we go ahead and put it on together now. To begin our installation, first thing that I did was lower our spare tire and just temporarily remove it. Just gives us a lot more room to work and make things really easy. So now we can move up inside of the bed. And over here on the driver's side, we're gonna have this factory cover and we need to get that out. It should just have some clips in there. I'm gonna take this screwdriver, a flat-head, and just pry on it. See how the one clip just popped off and not really a big deal. We're not gonna be reusing it, but that's the clip I pried on. And when you're prying that in, you can pull this thing right out. Now we can grab our harness here and the side that has this T-connector, we're gonna feed that through our opening. I think I managed to get it through there, and we're just gonna drop that down. And then this side here, it's gonna plug into our 7-way and you wanna make sure to take this adapter piece as well. And that's gonna eventually snap in there. So put that on the back. What I'm gonna do is use some dielectric grease in the terminals to help prevent corrosion. You can grab a tube of this here at etrailer if you want. And just simply plug it in. So with that plugged in, we can feed everything into position here. Try to get it lined up. I feel like my wiring's gonna get jammed on there, but I make do here. So I get that lined up and here we want it. And then we can take our provided screws. You wanna use the long ones if you're using this cover. So they'll give you short ones too and we'll just secure it down. So now back underneath the truck, here's our wiring dropped down and I took our connector plug and just push it up and over our frame. And over here to this area where our factory plug is, and now we need to unplug it. So there's a keeper you'll pull out on and you can squeeze on it, pull it out. So just a better view there. That keeper, so you pull back on and then you push down on the center to pull it out. And what we're gonna do now with the new plug, let's put dielectric grease on this. Just do that to both sides of it. And from there, what we're gonna do is plug in one side to the factory connector there and plug the other side right in here. And then what I'll do is come back using some of the provided zip ties. You just zip tie up our wiring to keep it out of the way and tidy up our install look. So this is what it looks like once I zip tied it up, and I just did my best to keep everything up and out of the way. But now that that's done, we'll go ahead and put our spare tire back in place. Now it's a good idea to test the wiring just to make sure everything's working properly. So I'm using this test box and we'll run through our lights. So we have our running lights, our brake lights, the left turn, the right turn, and our reverse lights. You have our 12 volt auxiliary power. And as far as the trailer brake goes, the truck is too smart for this test box. So it's seeing that there's something plugged in, but there's no load on it. So we can't really test that with this box, but assuming everything else is working properly, the truck recognizes something's actually plugged into it. I feel like it'd be safe to assume that that would also work as well. And that'll finish up our look at and our installation of the CURT In-Bed 7-way vehicle wiring harness on our 2022 GMC Sierra 2500..


Info for this part was:

Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Ryan G
Test Fit:
Ryan G

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