Hopkins 4-Wire Flat Adapter | 6-Way Round to 4-Way Flat, LED Test Lights

Mismatched trailer connectors are one of the most common headaches at the hitch, and this adapter solves it by bridging a 6-way round plug to a 4-way flat without any cutting or splicing. Just plug it in between the vehicle and trailer harness and you're wired up.

What sets it apart is the onboard LED indicators built into the housing. If your trailer's running lights, brakes, or turn signals aren't working right, the LEDs let you check each circuit at the connector itself instead of guessing where the fault is hiding.

• Converts 6-way round to 4-way flat for quick connector compatibility
• Built-in LEDs light up per circuit for on-the-spot troubleshooting
• Lets you isolate a wiring problem without pulling out a test light
• Compact, lightweight housing that's easy to store in a tow vehicle
• Simple plug-and-play install between existing connectors

If you tow with a vehicle wired for 6-way round but pull a trailer with a 4-way flat harness, this adapter gets you connected and gives you a fast way to chase down any lighting gremlins.