Oyviny 7/4 Pin Trailer Tester with LEDs

Updated September 25, 2026

Condition: NEW- Functional?: Yes Missing Parts?: No ASIN: B0DBL45YFN 2 in 1 Design: This trailer wiring tester combines both 4 pin flat and rv blade 7 pin trailer light tester, allows you to test both the 4 and 7 pin trailer connectors; Note: This trailer tester does NOT work with vehicle has a lamp-out sensor Upgraded Double-Sided LED Indicators: 4pin & 7 pin trailer circuit tester designed with LEDs on both sides, Unlike the other testers only have one side leds, which make it hard to read; A great tool to help troubleshoot issues or verify you have install or fixed your trailer plug correctly 6 Light Functions: Versatile trailer connector tester can be used to test 6 separate trailer light functions, quickly confirm the functionality of taillights, brake lights, reverse lights, turn signals, electric trailer brakes and 12V auxiliary power on your vehicle Bright LED Indicators: Trailer hitch tester equips a LED light for each electrical function; Plugging the light tester and check, you can easily read the green LEDs and find out which wiring has a problem Durable Construction: For long-lasting use, this 7 blade RV trailer tester is made from durable ABS plastic, which will never rust or corrode, Tin-Plated copper terminals makes great conductivity Simple to Use: No batteries or wiring needed; 7 Blade & 4 Pin Tester is easy to use, ergonomic design is convenient for plugging in or unplugging; Widely used to test trailer light circuits on most Trucks, Boats, Trailers Campers, Caravans, Food Vans and other Towed Vehicles.

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