GMC 300 TH400 Electrical, Lighting and Wiring Parts

This resource contains a transmission pan shape ID chart and other tips to help with identifying GM transmissions.

Learn how to install a side detent shifter in a 1969 Chevy C10.

Check out this headlight wiring and taillight wiring diagram.

Testing a 2 or 3 wire speed sensor sounds difficult, but these videos show that it actually is quite easy!

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.

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 employee Jess M. talks about the custom battery tray and cables she built for her '33 Ford.

Learn how to install spark plug wire terminal ends. Our step by step guide takes you through terminal end and boot installation with the use of a wire crimping tool.

Learn about the wiring of GM HEI Ignition Distributors with our diagrams and guide. Ensure you are getting the best performance out of your ignition system.

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