Mercury Muscle & Classic Car Engine Wiring Harnesses

Wiring of your race car or hot rod can be completed at home with these helpful automotive 12 V wiring tips.

Electrical wiring is one of those tasks that enthusiasts dread tackling on their own. We're here to tell you that wiring your project vehicle is something you can do with a little help from your friends at Speedway Motors!

Read how to wire a lightning sprint engine. This detailed account of how to successfully wire an engine will ensure a smooth installation.

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.

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

This Chevelle project gets rewired with a Speedway Motors 22 Circuit wiring kit. Follow along as Jeff guides you through this application, starting with a good mounting location for the fuse box. Learn more on continuity, grounding and relays.

This drag and drive '49 Mercury is not at all what you'd expect from a chopped Merc. It's part custom, part hot rod, and built to do it all.

Unbox our most popular wiring harness with Tim.

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

I'm sorry to have to tell you this, but the '64 GTO was not the first muscle car.