Mercury Custom 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.

Mick Rau has a garage full of cool cars, but this Hirohata-inspired Merc is a standout.

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

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!

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

Follow along as Product Guru Jeff K. talks about customizing a Comet Pedal Car for his son!

How to replace sway bars in a Mercury Comet and the advantages that come with it.

Having a difficult time deciding which racing harness to use? With many options to consider from size to closure type, this article will walk you through how to go about choosing the perfect one for you and your race car. Safety first!