How to Wire a Model T Ford

Introduction

The Model T Ford was the first mass-produced, affordable automobile. Over 15 million Model Ts were built between 1908 and 1927. Wiring one of these iconic cars is straightforward, but does require some basic knowledge. In this article, I will walk through the complete process of wiring a Model T Ford from start to finish.

Gather Tools and Materials

Before beginning the wiring job, I first gather all the necessary tools and materials. Here is what I need:

• Wire strippers - to strip insulation off wires
• Pliers - for crimping wire terminals
• Electrical tape - to insulate wire connections
• Wire brush - to clean metal surfaces for ground connections
• Multi-meter - to test circuits
• Replacement wiring harness - pre-made harness for Model T
• Sealette cloth tape - to secure harness to frame

Having all the proper tools on hand will make the wiring job go smoothly. It's also critical to get an accurate wiring diagram for the specific Model T I'll be working on.

Remove Old Wiring

Before installing the new wiring harness, I first need to remove the old, worn out wiring. Here are the steps:

• Disconnect the battery - this prevents accidental shorts while removing wires
• Label wires - use tape to label wires before disconnecting, for easy reassembly
• Unbolt components - unbolt lamps, horn, starter, etc to access wiring
• Cut zip ties and unwrap tape - remove any bindings securing old harness
• Pull wires out - carefully pull wires out of clips and conduits

Taking the time to properly remove and label the old wiring prevents headaches during reinstallation. I also inspect the wires for any corrosion or damage.

Install New Wiring Harness

With the old harness removed, I now focus on installing the new pre-made replacement harness. Here is the process:

• Lay out harness - lay new harness near original position to visualize routing
• Secure harness - use sealette tape and clamps to secure harness to frame
• Route wires - route individual wires to proper components
• Crimp terminals - crimp included terminals onto wire ends
• Connect terminals - plug terminals into lamps, horn, starter, etc.
• Neatly wrap - use tape and wire ties to neatly wrap and secure

I take care to route the new harness similarly to the original for a clean factory look. Securing the harness properly prevents vibration damage.

Reconnect Battery and Test System

With the new wiring harness fully installed, the final steps are to:

• Reconnect battery - securely reconnect battery terminals
• Check connections - inspect all connections to ensure tight fit
• Test lights - turn on lights to verify operation
• Test accessories - sound horn, engage starter to test
• Start engine - start the engine to confirm proper operation
• Inspect harness - visually inspect entire harness one last time

Carefully testing each light and accessory confirms the new wiring harness works correctly. The Model T should now start and operate normally again!

Conclusion

wiring a Model T Ford is actually a quite straightforward process with the right materials and tools. By methodically removing the old harness, installing the new one, and thoroughly testing operation, I can restore a Model T's electrical system to proper working order. With some basic mechanical skills and knowledge of automotive electrical systems, wiring this iconic car is a very achievable do-it-yourself project. Just take it slow, double check all connections, and don't hesitate to consult a wiring diagram.