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Trailer Wiring Harness Installation - 2008 Nissan Titan

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How to Install the Trailer Wiring Harness on a 2008 Nissan Titan

Speaker 1: Today on this 2008 Nissan Titan we'll be having a look at and showing how to install the Hopkins factory-style seven-way and four-way flat vehicle and trailer connector, part number N40975. Here's what our wiring looks like installed. This is a very nice setup because we have these built-in spring-loaded doors that have dust covers built into them. We have a rubber gasket on the inside to provide us a nice seal to help keep out the elements, giving us a nice solid electrical connection for many years to come. On the left side of it we have our standard seven-way connector. The seven-way connector gives us all the functions we need in order to tow a trailer, including one that has electric brakes, provided we have a brake controller installed on our Titan.

We also have a charge line in order to charge any accessories you have on the trailer or to supply constant 12-volt power to anything you need.On the right side of it we have our standard four-pole flat connector which gives us the basic lighting functions that are required by law in order to safely and legally tow a trailer. What's great about this wiring kit is not only does it come with one of the mounting brackets that we need, it comes with a connector that gives us both the four-way, the seven-way, plugs right into our vehicle's factory tow package so there's no modification required, and it comes with the necessary relays that are needed in order to activate that factory tow package.Now that we've gone over some features, we'll show you how to get it installed. The first thing we need to do is go underneath the back of our vehicle behind our hitch in front of our spare tire and locate the factory seven-way connector. If we look up right here we'll find a seven-way connector. We can pull down on it.

We have our protective cover on it. Need to remove that by pressing on this tab right here. Push and pull back. Now our seven-way connector kit comes with this bracket that we can use to attach it to our vehicle. Now we're not supposed to drill these directly into hitches because if you do that you can compromise the structure of the hitch.

So we have a no-drill bracket which we can clamp to our hitch using a clamp, when that's just perfectly acceptable. We have these available on our website at part number 18140.What we're going to do is take the bracket. We have a round hole and an oval hole. We'll line them up together. We'll just use a pair of vice grips to secure it.

I'm using one on this other side too. With these clamped together we'll use the provided self-tapping screws, which use a 1/2" socket. We can attach the two together permanently.Now that we have both of our screws loosely started, we removed our clamps, our vice grips, whatever you used, and we can run the screws in rest of the way. That gives us a nice solid mount. We don't have to worry about that ever coming out.Now that we have our bracket assembled, we'll attach it to our hitch with our clamp. Once we have it started we can just tighten the clamp down with a 5/16 nut driver or a screwdriver. You can see how solid of a mount that's going to give us. I'm actually shaking the whole truck just off of this mount.Now we use a pair of tin snips and cut off our excess clamp. Now we'll take our connector which has our seven-way and our four-way flat and we'll simply just push it into our bracket and it'll clip and lock into place.Now we need to get a little more slack in our seven-way connector. Right up here on the bumper support it's clipped into the frame. We'll just use a trim panel tool, get underneath it, and pop it loose. Then unclipped, you can see what the clip was right there. That went into the bumper. Now woo hoo plenty of slack to plug this in.Now what I like to do is take some dielectric grease, which we have available on our website, put it into our connector here. This will help prevent any corrosion from occurring, possibly giving us a short or a poor connection. Then we can simply plug it into the backside of our connector. Just line up the tabs. Only goes in one way. Push until it clicks. Pull back on it and make sure it's secure, which it is.Now we find ourselves underneath the hood on the passenger side of the vehicle. Right behind our battery next to the firewall we find a fusebox. We'll need to open this up by lifting up on the tab on the side. Now inside the fusebox we find three unoccupied relay connectors. We'll take our provided relays. We have two blue ones. Those go to the white terminals here. These only go on one way so you don't have to worry about that. We'll just take them, push them until they click into position. Then we have our brown relay which goes to this connector. Again, that only goes in one way. That one will click into position too. With our relays plugged in, we'll now reinstall our cover, pull up on it and make sure it's not going to come off, and we're good.Now we're plugged into a trailer tester. You could also test this just by hooking it up to your trailer and making sure all the functions work, but if you have a problem with your trailer, you wouldn't know if it was an issue with the trailer or the vehicle itself. That's why we're using one of these testers. We'll run through all of our functions and make sure everything's working properly. We don't have a brake controller hooked up right now so you won't see that function. We're showing that we have power on our charge line on our gauge. Turn our headlights on. We have a clearance light function. Left turn signal works. Right turn signal works. Our brakes work. Our brakes work properly with our turn signals and we have a backup light function, or if you're towing a boat trailer that could actually operate your solenoid for reverse lockout. That completes our look at and showing how to install the Hopkins factory-style seven-way and four-way flat vehicle and trailer connector, part number N40975, on this 2008 Nissan Titan.

Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Nicholas E
Test Fit:
Nicholas E
Employee Brent H
Test Fit:
Brent H
Employee David F
Test Fit:
David F
Employee Kathleen M
Video by:
Kathleen M
Employee Hayden R
Video by:
Hayden R

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