TRAILER WIRING CHECKER — VERIFY YOUR HARNESS IS CORRECT
Select your connector type. Verify your trailer wiring is correct and identify any pin errors in seconds.
Trailer Wiring Harness Checker — Is Your Electrical Setup Road Legal?
A trailer with no brake lights is a hazard and a citation waiting to happen. Check your wiring before you leave the driveway.
Select your trailer connector type, vehicle, and trailer features. The checker confirms which wiring functions are required by law and flags any missing circuits.
Federal law (FMVSS 108) requires fully functional trailer lighting. State troopers routinely issue citations for brake light, turn signal, and marker light failures.
Anyone towing a trailer on public roads — car trailers, boats, campers, livestock.
- FMVSS 108 trailer lighting standards
- SAE J2863 wiring standards
- State trailer equipment laws
CHECKER
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.
SHARE THIS RESULT: