7 Pin Connection Tester Designed to plug into a vehicle side wiring harness. 7 lead each corresponding to the correct circuit. It has an LED indicator light and when it doesn t illuminate relatively it symbolizes that a problem exists from the vehicle wiring harness back to the fuse box. It s the easy and quick way to test trailer circuits on most trucks. The tester is made from LEDs and nylon housing that ensures durability. 7 way. Specifications Weight: 0.5 lbs - SKU: WLLCH9048