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A solid connection keeps your trailer lights working right every time. The RoadMaster 4-Wire Connector gives you a clean 4-round vehicle-end socket that matches up to standard 4-round trailer plugs. It’s a straightforward setup that’s perfect when you’re wiring a tow vehicle to a trailer or building your own custom adapter.
Getting a snug, reliable mount makes all the difference in durability and appearance. This connector installs neatly with 1-3/4" center-to-center hole spacing and needs only a 7/8" cutout to fit the body through. Once it’s mounted, it sits flush and solid for a clean factory-style finish that stays put even after years of use.
Whether you’re converting from a flat plug, setting up a new tow vehicle, or replacing an old connector, this plug makes it easy. It’s designed to match standard 4-round trailer connectors like the PK11402 trailer-side plug, so you can mix and match components or wire in fresh leads based on function. That flexibility means you can get exactly the setup you need—no guesswork, no mismatched fittings.
Roadmaster builds their connectors to handle regular towing use and keep your wiring secure. With solid terminals and a tight-fitting design, the plug ensures dependable signal transfer for running lights, turn signals, and brake lights. It’s a small part that plays a big role in keeping your trailer visible and safe every trip.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today, we're going to take a look at the Roadmaster 4-wire vehicle end trailer connector. Now, this connector will install in the vehicle that's being towed to allow you to plug in a 4-pin plug from the tow vehicle. This replacement socket will fit the Roadmaster 4-wire straight and the Flexo-Coil electric cords. Includes this nice spring-loaded cap that will automatically drop down to cover the connector when it's not in use. And to install your wire to this, you just run your wire back through here, make your connections to the 4-pin, and you're ready to go. Just to show you where those connections are made, to do it, you just take out this little Phillips head screw and once that screw comes out then just open the cover or the plate and then just tap it and you'll see the center comes out and there's your 4-pin. And on the very back is where you'll make your wire connections.
So, just run your wire through here, bring it out, make your connections, and then all you have to do is slide this right back in. Make sure the hole at the top lines up correctly. Once you get that hole to line up, then go ahead and take your . Let's get the little Phillips head screw. Once we get that put on the screwdriver ...
There we go . And just line it up with the hole and go ahead and tighten it back down. Then once you get it all tightened down it's secure and ready to go. Then you're all ready to plug in your connector. That should do it for the review on the Roadmaster 4-wire vehicle end trailer connector.
Ratings & Reviews
Great product
Navigating the search was a little difficult but once I found the product ordering was simple. The parts were delivered sooner than expected.
Good product
Was exactly what I wanted. Part worked great and the service was fast.
Easy to install and works great.
E.trailer had the product I needed. Delivered it promptly. Very Happy,
Used it for a test cable, worked great
Received the product I ordered and I received it on time. I recommend this company. He made up earlier with those guys in them part of the show
Fits and works great on my tow car.
Easy install. Working great after 7 months of constant RVing!
Replacement for an older vehicle, arrived as promised.
The exact part I needed to connect the electrical on my towed vehicle. I had the part in two days. Excellent!
Used with bracket to mount connector to my 2012 Jeep.
Works great with Road master tow bar.
Exact product that was on my old jeep - moving the auxiliary braking system to the New 4XE, and this will fit my current cable perfect.
Very helpful.good quality parts.very timely shipping.. would definitely use again..
Your price were better than any of your competitors and even my local parts houses. I have always been very satisfied with you products and prices and the quick shipping.
The lighting kit connectors I purchased came on time and were packaged securely. Entire order and delivery process was flawless!
The Roadmaster 4 wire connector is very good quality to connect my vehicle to motorhome.
This 4 wire connector works as it should. Good finish and have used them in the past for many years with no problems. Good product and good service from trailer. The connector arrived on time.
Etrailer is a very solid company for all of my RV and trailer needs. They help me find the right product for my vehicles and have very helpful installation instructions and videos. Their pricing is reasonable and the shipping times are very good with excellent follow-up.
These 4 wire round connectors look quite robust and are priced right! Shipment was super quick. etrailer is the best!
The new TOAD bar I bought for my new Jeep came with a different wire connector than my existing tow hitch. This connector is an exact match and the wiring instructions were easy to decipher.
We just finished a makeover of our 1995 boat trailer. New bunks, sanded and painted but the best part of the project was the new LED lights from your company. They are so much brighter than the old incandescent bulbs that you really do feel safer driving down the road. We pulled the 20 year old wire out and replaced with new and used the 3M scotch loks to tie in. We were not sure the new style grommets would fit the old holes in the frame but they fit great. Your customer service was great, alerting me to a backordered reflector but recommended a replacement that worked fine. Patrick set up a Q&A page for me since I had questions about the best way to protect connections with dielectric grease, heat shrink and tape. Your website is one of the best with ease of navigation, complete pictures, great selection and thorough info, dimensions, etc. You guys really have your act together and also offer great value. I would not hesitate to purchase again and will recommend you when I can. I have attached a couple of pictures. Thanks for all your help. Wayne N.
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Normb
2/28/2022
Still working great after a year of use.