Cadillac DeVille Headlight Wiring Harnesses

A guide on how to install a universal wiring harness in a car. Read tips on properly wiring taillights, headlights, gauges, ignition switch, steering column and more.

Check out this headlight wiring and taillight wiring diagram.

In this Tech Tip, John answers a customer question about the Speedway 12 Circuit Wiring Harness.

In this Tech Tip, a returning customer asks for advice on wiring harnesses for his ’29 Ford roadster project.

Speedway Motors just added some exciting new options to our line of racing harnesses.

Watch our Steering Column Wiring Guide video for useful tips on wiring your new steering column for your vehicle. Ididit takes you through the wiring process.

This project consists of using welding cable to relocate a battery to the trunk of a 1967 Chevelle. Learn the benefits of using welding cable over normal battery cable and how line clamps are used to secure the wire to the frame rail.

Follow along as Jeff installs Mr. Gasket aluminum finned valve covers and gaskets to his iron-head engine. Learn how to prep the covers for a fresh coat of engine paint!

See how to properly install a DeWitt's Direct Fit radiator in a 66-67 Chevelle. Learn the benefits of Black Ice coating on this radiator including optimal heat transfer.

Warranty information for DeWitts aluminum radiators.