【Practical Function】: Convert a 4-pin flat socket into a 7-pin blade circular socket. 7-way connection for taillights, reversing lights, turn signals, brakes, and auxiliary power supply, ensuring a tight connection between the vehicle socket and trailer plug, without any shaking space or loose accessories. Transfer power from the vehicle to the trailer. Voltage range: 6-24 volts.
【Easy Installation】: Easy to install, including all necessary mounting brackets and screws+nuts. Suitable for most trucks, it helps to quickly identify lighting issues with 4-way and 7-way trailer circuit connectors on the vehicle end.
【Wide Application】: Durable black plastic structure, rust resistant, and enhances appearance. A well sealed spring cover can enhance dust, moisture, and corrosion resistance. It is suitable for most trailers, semi trailers, and RVs. Usually used with T-joints or taillight converters, with 4-way flatbed termination.
【Full Function】: The unique design allows you to connect the 7-pole trailer light plug to the factory's 4-pin socket, providing a fully functional 7-way connection for the trailer's tail lights, brake lights, turn signals, backup lights, electric trailer brakes, and auxiliary power supply (12V+line). The MECMO two in one tractor trailer lamp socket tester includes a 4-way circuit tester and a 7-way trailer plug tester.
【LED Indicator】: Design an easy to read LED light for testing the status of the trailer light circuit: confirm the functions of the brake lights, turn signal lights, tail lights, parking lights, backup lights, electric brakes, and 12V (auxiliary power supply) of the vehicle's trailer harness. With indicator light diagnostic LED (red light), it is easy to read the signal and understand if you have safe vehicle side trailer wiring.
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