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.

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

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

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!

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

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