Oyviny 7 Way Blade & 4 Pin Trailer Light Circuit Tester with LED Indicators

Oyviny Multi-Function 4 Way Flat and RV 7 Way Trailer Light Tester is great for testing taillights, brake controller output, back up or reverse circuit center pole, right turn/brake, left turn/brake and 12-volt power, whether you have just installed a new vehicle-to-trailer wiring harness or are trying to locate the cause of an electrical problem.

Part of towing responsibly is making sure your trailer lights are working properly. This 2-in-1 tester helps troubleshoot and get your trailer connectors all right before picking up your trailer by allowing you to test different trailer connectors.

7 Way Trailer Plug Tester allows you to test your wiring harness by simply plugging the 7-way trailer light tester into the vehicle's 7-pin trailer connections to ensure they are correct. 4 Pin Trailer Tester quickly confirms the functionality of your vehicle's trailer wiring harness with this 4-way tester for the taillights, brake lights and turn signals.

The tester's various LEDs will light up corresponding to each wire in the 7-blade and 4-pin connectors when the socket is getting proper power, providing bright LED indicators. Designed with a durable and compact ABS plastic housing that is weather-resistant, the tester features brass connectors for better conductivity.

This 7 Pin and 4/5 Pin Tester can also act as a 7-way to 4-way trailer adapter, converting the vehicle-side 7-pin output to a 4-pin flat adapter to connect the 4-way trailer light plug. It can be used to test 6 separate trailer light functions, quickly confirming the functionality of taillights, brake lights, reverse lights, turn signals, electric trailer brakes and 12V auxiliary power on your vehicle.

However, there are a few things to note about this tester: - It may be upside down when plugging into the socket on 2017 and newer Ford/GMC/Chevy models, as the manufacturer changed the 7-way plug position. - It cannot test LED lighting systems, as the tester cannot recognize the low current of LED lights. - It does not work with vehicles that have a lamp-out sensor, such as BMW, VW, Audi, Mercedes-Benz, and Porsche.

Regardless, this 7-Blade & 4-Pin Tester is easy to use, with no batteries or wiring needed. Its ergonomic design makes it convenient for plugging in or unplugging, and it is widely used to test trailer light circuits on most trucks, boats, trailers, campers, caravans, food vans, and other towed vehicles.

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