etrailer | Optronics 25 Ft 4-Way Trailer Wiring Harness Review

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Hey everybody, how's it going Today, we're gonna be going over and showing you how to install the Wishbone 4-way 25 foot trailer wiring harness. So this trailer wiring harness here is gonna be the perfect option for any trailer up to 25 foot. Now, if your trailer isn't that long, it's perfectly fine. We would just go ahead and trim off the extra which is actually what we had to do for this particular application. But so long as it's not over 25 foot, this is gonna be a great kit for you. So this particular kit provides a standard 4-way flat, also referred to as a 4-pole trailer connector.

This is the most common type of trailer connector and the one you're gonna be using if you don't have electric brakes on your trailer. If you do have electric brakes, you're actually gonna be using a 7-way so you wouldn't use this. But for every trailer without a 7-way, it's gonna have this standard 4-way. This is the most commonly and widely used one. So a 4-way trailer connector is gonna transmit the running light circuit.

That's gonna transmit the stop and turn signal circuit for both the driver and passenger side. And there's also gonna be a pin on there for ground. So those are your four total of circuits there. This particular one is a Wishbone configuration. So what a Wishbone configuration is, it basically means there's gonna be two running lights one for each side.

Some 4-ways don't use that Wishbone and they just have a running light wire coming from the front to the rear. Just one wire and then they splice into the two running light circuits at the rear. So it really doesn't matter which you have. We can either run a running light wire for each side or just one and then tie it together at the rear. This one here, there's a wire for each side.

I kinda prefer this. It makes it a little bit easier. But again, you can use it no matter what your trailer has. So this kit has many different uses. Some people, their taillights are getting older. They're cracking, they get sun damaged and they're gonna replace the taillights. They figure that might as well replace the entire trailer wiring harness, which is what we did here. Or if you're building a trailer, it's gonna be an excellent option for that. Now over time, the jacket on those wires can get hard and crumbly exposing the bare wires underneath causing shorts. So that's a good time to upgrade as well. Really, it just really gonna be by age or if you're replacing other components. This is great kit here just to add to your complete set up there so you can make sure everything's working properly and you don't have any lighting issues down the road. So keep in mind, this wiring harness is compatible with both standard and LED taillights. We actually upgraded the LED taillights on this trailer. So it's gonna work great with both. The wire size is gonna be adequate for both of those types of bulbs. So now that we've gone over the wiring harness a little bit, let's go ahead and show you the installation. So first step of your installation, you're gonna go ahead and remove your old wiring harness here. You can see, we have a nice bundle here. It's quite messy. Now you can be as neat or as messy as you want when you're removing this. I end up just cutting a lot of this off 'cause I knew we weren't gonna be reusing it. So it was much faster just to cut everything off and then pull it all out. But now that we've got all the old wires out, we'll go ahead and start running the new ones. So next we're gonna take our wiring harness here and just untangle it as best as we can. So this is actually known as a Wishbone wiring harness. Now what a Wishbone wiring harness means is there's gonna be a running light circuit on each side of the trailer. So normally, they'll tie the running lights in at the back of the trailer, then they'll just run one wire up to the trailer connector. Here you actually have two brown wires for the running lights that go to the back of the trailer connector. So doesn't really matter which one your trailer uses. You can install this either if it had a Wishbone before or just had the standard one. So our two white wires here, these are for the ground. These run back to each taillight assembly. Our two brown wires, that's what we talked about. The Wishbone design. One goes to the driver taillight assembly. One goes to the passenger. And we have our yellow wire here, this will go to the driver's side. And then the green wire will go to the passenger side on the right. So what

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If you've never wired a basic trailer before, this is a good tutorial. I personally like to use posi-taps for my connections and if not the water-tight kind, then I spray some clear electrical "tape" product to seal the connection.