Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
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
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Normb
2/28/2022
Still working great after a year of use.