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Hopkins 4-Wire Flat Tester with 6-12V Circuit TesterSee on Walmart
Hopkins makes your towing experience simpler and more rewarding through innovation and value. The Hopkins 4-Wire Flat Tester with 6-12V Circuit Tester tests left/right turn signals, brakes and taillights. The red LED light will glow if the connection is correct. Quickly and easily confirm if your vehicle 4 flat connector wiring is properly installed and functional. Doubles as a dust cover to keep it handy! LEDs test left/right turn, brake and taillight. Kit includes a 6-12 volt probe circuit tester.... read more.