30 (other red wire) needs constant 12-volt power from the battery. 86 (gray/white wire) goes to the ignition switch. 85 (black wire) connects to the temperature-controlled sending unit.

Testing relays and their circuits in vehicles doesn’t always require a trip to the bench. With a few simple tools and ...

In our last installment on Scarlett, our ’72 coupe project car, we routed all the engine wiring through a single circular connector on the firewall in preparati ...

Ford Racing's two new wiring kits are called Control Packs and were designed, initially, to be offered along with Ford's modular crate engine offerings to provide kit car, street rod, and muscle ...

Rodent-damaged wiring in cars has become so widespread that several class-action lawsuits have been levied at automakers. Read more at Car and Driver.