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Fifth Wheel and Gooseneck Wiring Harness Installation - 2016 GMC Sierra 2500

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How to Install a Fifth Wheel and Gooseneck Wiring Harness on a 2016 GMC Sierra 2500


Today on our 2016 GMC Sierra 2500, we'll be having a look at and installing the Draw-Tite Fifth Wheel Gooseneck Wiring Harness with the 7-pole connector. Part number 20110. Right here's what our 7-way looks like installed. As you can see, it sits up nice and flush against the bed at the side of our truck here close to the back. It's easy for us to hook up to. We don't have to worry about draping wire down over our tailgate when we hook it to our gooseneck or our fifth wheel trailer.

Readily accessible, will have all the functions we need in order to safely tow our gooseneck or our fifth wheel trailer. What I really like about this kit compared to others is that the connectors are already pre-installed on it. You don't have to build any of the connectors onto the wiring harness. It's a simple plug and play. All you have to do is just drill one small hole, pass your wires through, put the connector in place, secure it with self-tapping screws and you're ready to hit the road. Now that we've gone over some features, we'll show you how to get installed. First thing we need to do is find a place to mount our 7-way connector.

We're going to put it right here in the lower left side of our bed, so we'll make a pilot hole right here in the middle. Now, we'll use a hole saw, the size of which is indicated in the instructions, to make a hole for our wires to pass through. Now, we'll pass the end of our wiring harness with the two connectors on through our hole. I'll just feed the wire on down through where we'll plug it in to our 7-way connector now, and make sure this lock tab is pulled out. Push it in until it stops, pull back, make sure it's secure and secure the lock by pushing it in. Now, we'll push our wire the rest of the way in with our connector.

We'll secure it to the side of the bed with the provided self-tapping screws. Now, we'll make sure it's as level as possible, and we use a quarter inch bit to ride 00:02:18 in our self-tapping screws. That gives us a nice solid connection now for our gooseneck or our fifth wheel trailer to plug into. Here's where our wire came down from the side of our bed. We went ahead and routed it over our frame here, making sure we kept away from our suspension, comes over here and went above our spare tire removal tool spot there. Take some of the slack off and we're left with our connector right here, where we'll be plugging into the factory 7-way here.

We'll pull back on this gray lock tab like we did earlier, push in on the black tab and separate the wiring harness. We'll plug the male and the female into the wiring harness until it clicks into place. Secure the lock tab, and we'll do the same over here. Pull back on it to make sure it's secure. Now, we'll just bundle up our wiring so it's up and out of the way. Let's use a couple of the provided zip ties to secure our wiring up to existing wiring harnesses on the vehicle. With all of our connections made, we'll now test our wiring. We have a 7-way tester here plugged into our newly installed 7-way in the bed of our truck. We'll start off by making sure we have constant power going to our 7-way. You see here, we have more than 12 and a half volts of power running to it so we know that function is working. Now, I'll step inside the vehicle and run through the rest of our functions. As you can see here, we also have working clearance lights, left turn signal, right turn signal, brakes and we also have working reverse lights. Now, I'll hit the manual override on our trailer brake controller and we'll see that working too. That completes our look at and installation of the Draw-Tite Fifth Wheel Gooseneck Wiring Harness with the 7-pole connector, part number 20110, on our 2016 GMC Sierra 2500.


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