4-Pin Trailer Plug Tester - 4-Way - Flat - Light Tester - For Towed Vehicle Wiring - With LED Indicators - Circuit Tester - Car Accessories - 2 Pieces

4-pin flat trailer plug tester: Insert the tester into the trailer, check the taillights, brake lights, and turn signals, and identify any faults based on the LED indicators. The 4-way trailer tester is made from high-quality materials that are wear-resistant, robust, and durable. It can be used for extended periods to maintain a secure and stable connection and is easy to grip. The rear end has a loop for attaching it to your keychain; it is lightweight and convenient. The trailer wiring harness tester is easy to use, and for each electrical function, the LED illuminates to indicate a good signal. Insert the trailer tester into the vehicle's socket and activate the LED indicator to verify the function. The trailer test adapter requires no tools for plug-and-play operation and nothing else is needed to effectively test the trailer wiring harness. Double-sided design. The trailer wiring tester is suitable for all types of trailers, including boat trailers, horse trailers, ATV trailers, and multi-purpose clutch devices for cargo trailers.