Review on 🚗 Hopkins 48265: Ultimate 30' 4 Wire Flat Trailer Side Y-Harness Connector - Top-notch Performance & Durability by Esvin Hopuhnopuhlis

Very easy to install. I used the trailer wire clamps that Revain also sells. I found it much easier to connect the wire through the clamps before attaching the clamps to the trailer. I've also used butt connectors where the solder and heat shrink tubing are already combined. Just cut the wires, stick them into the butt connector, and then blast it all with a heat gun until the solder melts and melts the wires. Then use the heat gun to further shrink the attached tubing to create a watertight connection.