Innovative Products Of America 7893 7-Way Flat Pin Tractor Trailer Circuit Tester<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Designed to plug into vehicle side wiring harness where its 7 lead each correspond to its circuit</li><li>LED doesn’t illuminate relatively it symbolizes that a problem exists from the vehicle wiring harness back to the fuse box</li><li>Ensures durability and is backed by a 1 year warranty</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41SpEsMPaGL.jpg" noproxy>