Spectre Performance GMC C3500 Electrical, Lighting and Wiring Parts

Learn about some of the differences between factory plug wires and the improvements you'll receive with a quality set of aftermarket performance wires in our spark plug wire buyer's guide

Testing a 2 or 3 wire speed sensor sounds difficult, but these videos show that it actually is quite easy!

Check out this headlight wiring and taillight wiring diagram.

Are your gauges reading erratically or does your car run out of power at high rpm? It may be the cause of a bad ground. Speedway Motors can show you how to diagnose and fix the problem in no time at all!