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Features and Benefits: Quickly and easily test trailer circuits on most light to medium duty trucks and campers Tests vehicle circuits on 7 Flat/Spade Pin connections - quickly identifies faulty circuits Made from LEDs and ABS plastic - ensures durability 1 Year Limited WarrantyTester plugs into vehicle side wiring harness. Each of the 7 leds on the tester correspond to the correct circuit. An LED not lighting up for a particular circuit indicates a problem from the vehicle wiring haress back to the fuse box.