1973 F100 Wiring Diagram

The 1973 Ford F100 is a classic truck that requires proper maintenance and repair to keep it running for years to come. One of the critical components of the truck is the electrical system, which includes the wiring harness. If you’re having problems with your electrical system, it’s essential to have access to a reliable wiring diagram to troubleshoot and repair your truck.

History of the 1973 Ford F100

The 1973 Ford F100 was a part of the fifth generation of the Ford F-Series pickup trucks, which was produced from 1967 to 1972. The fifth generation was the first to include a crew cab option and was the first to receive an updated body style in the middle of the generation.

The 1973 Ford F100 was available with four different engines, including a 240 cubic inch inline-six, a 300 cubic inch inline-six, a 360 cubic inch V8, and a 390 cubic inch V8. The truck came with a three-speed manual transmission as standard, and a four-speed manual or automatic transmission was available as an option.

Why Do You Need a Wiring Diagram?

A wiring diagram is a roadmap for the electrical system of your truck. It shows the wires and connections between different components, such as the battery, starter, alternator, lights, and more. With a wiring diagram, you can identify which wires are involved in a particular circuit and troubleshoot any problems you are experiencing easily.

Without a wiring diagram, you would have to trace the wires manually, which can be time-consuming and complicated. A wiring diagram can save you time and money and make it much easier to work on your truck’s electrical system.

How to Read a Wiring Diagram

Reading a wiring diagram may seem complicated at first, but it’s pretty simple once you understand the basics. A wiring diagram typically shows the wires, symbols, and connections between components. Here are some of the symbols you may see in a wiring diagram:

Symbol Definition
Battery Represents the battery or power source
Ground Represents a connection to the body or frame of the truck
Switch Represents a switch or button that controls a particular circuit
Lightbulb Represents a light, such as headlights or taillights
Fuse Represents a fuse that protects a particular circuit

When reading a wiring diagram, it’s essential to follow the lines and connections to identify which wires are involved in a particular circuit. You should also pay attention to the symbols and labels to understand what each component represents.

The 1973 F100 Wiring Diagram

The wiring diagram for the 1973 Ford F100 is a detailed map of the electrical system of the truck. The diagram shows the placement of each wire and connection between different components, making it easy to identify and troubleshoot any problems with the electrical system.

Here are some of the components and circuits you can find in the 1973 F100 wiring diagram:

Battery and Starter

The battery and starter are critical components of the truck’s electrical system. The wiring diagram shows the connections between the battery, starter, and solenoid, making it easy to troubleshoot any problems with these components.


The alternator is responsible for charging the battery and providing power to the electrical system. The wiring diagram shows the connections between the alternator and battery, making it easy to identify any problems with the charging system.


The lighting system of the truck includes headlights, taillights, backup lights, and interior lights. The wiring diagram shows the connections between these components, making it easy to identify any problems with the lighting system.

Fuses and Relays

The wiring diagram also shows the location and connections of fuses and relays, which protect the electrical system from overload or short circuits. Identifying and replacing faulty fuses and relays can be a simple and cost-effective way to fix electrical problems.


Can I use the wiring diagram for a different year or model of the Ford F-Series truck?

The wiring diagram for the 1973 F100 may be similar to other years and models of the Ford F-Series trucks, but it may not be identical. It’s important to use the correct wiring diagram for your specific truck to avoid any confusion or errors.

What tools do I need to use the wiring diagram?

To use the wiring diagram, you may need a multimeter, electrical tape, wire strippers, and a soldering iron. These tools may vary depending on the specific electrical problem you are troubleshooting.

Where can I find a reliable wiring diagram for the 1973 F100?

You can find a reliable wiring diagram for the 1973 F100 from various sources, such as a repair manual, an online forum, or a specialized website. It’s important to ensure that the wiring diagram you are using is accurate and up-to-date.

How can I troubleshoot electrical problems in my truck?

To troubleshoot electrical problems in your truck, you should start by inspecting the battery, starter, and alternator. You can also use a multimeter to test the voltage and continuity of different circuits. If you are unsure how to troubleshoot electrical problems, it’s best to seek the help of a professional mechanic or electrician.