Shovelhead engines are a type of Harley-Davidson motorcycle engine that was popular during the 1960s and 1970s. These engines were known for their reliability and toughness, but their wiring diagrams can be confusing for those who aren’t familiar with them. In this article, we will explain the basics of a simple shovelhead wiring diagram in relaxed English language that will help you understand how to wire your motorcycle.
What is a Shovelhead Wiring Diagram?
A wiring diagram is a drawing that shows how electrical wires are connected in a system. For a motorcycle, this means showing how the different components like the battery, ignition switch, and lights are connected to each other. A shovelhead wiring diagram is specific to this type of Harley-Davidson engine, and it shows how the electrical system is connected and how it should be wired.
Before we get to the specifics of the wiring diagram, it’s important to understand some basics of electrical systems. Electricity flows from the positive (+) terminal of the battery, through the wires, and to the negative (-) terminal of the battery. The flow of electricity can be controlled by switches, such as an ignition switch or a light switch. Understanding these basic concepts will help you understand the shovelhead wiring diagram.
Components of a Simple Shovelhead Wiring Diagram
A simple shovelhead wiring diagram consists of several components that are connected to each other. These components include the battery, ignition switch, coil, starter motor, and lights. Each of these components is connected to the others by electrical wires, and the diagram shows how they are connected.
Battery
The battery is the heart of the electrical system, and it provides power to all of the electrical components on the motorcycle. In the wiring diagram, the battery is shown as a rectangle with a positive (+) and negative (-) terminal. The positive terminal is connected to the starter solenoid, while the negative terminal is connected to the frame of the motorcycle.
Ignition Switch
The ignition switch is used to turn the motorcycle on and off. When the switch is in the “on” position, it allows electricity to flow from the battery to the rest of the electrical system. In the wiring diagram, the ignition switch is shown as a rectangle with two wires coming out of it. One wire is connected to the battery, and the other is connected to the coil.
Coil
The coil is a device that converts the low voltage from the battery into a high voltage that is needed to fire the spark plugs. In the wiring diagram, the coil is shown as a rectangle with two wires coming out of it. One wire is connected to the ignition switch, and the other is connected to the spark plugs.
Starter Motor
The starter motor is used to turn the engine over when you want to start the motorcycle. In the wiring diagram, the starter motor is shown as a rectangle with two wires coming out of it. One wire is connected to the solenoid, and the other is connected to the battery.
Lights
The lights on the motorcycle include the headlights, taillights, and turn signals. In the wiring diagram, each of these lights is shown as a rectangle with two wires coming out of it. One wire is connected to the battery, and the other is connected to the switch that controls the light.
The Simple Shovelhead Wiring Diagram
Now that you understand the components of the shovelhead wiring diagram, let’s take a look at the actual diagram. The diagram is shown below:
| Component | Wire Color | Connection |
|---|---|---|
| Battery | Red | Connected to starter solenoid |
| Battery | Black | Connected to frame |
| Ignition Switch | Orange | Connected to battery |
| Ignition Switch | Green | Connected to coil |
| Coil | Black | Connected to spark plugs |
| Coil | Green | Connected to ignition switch |
| Starter Motor | Red | Connected to solenoid |
| Starter Motor | Black | Connected to battery |
| Headlight | White | Connected to switch |
| Headlight | Yellow | Connected to battery |
| Taillight | Brown | Connected to switch |
| Taillight | Green/Red | Connected to battery |
| Turn Signals | Orange/White | Connected to switch |
| Turn Signals | Green/Black | Connected to battery |
As you can see, the wiring diagram is very simple and straightforward. Each component is connected to the battery, and the ignition switch controls the flow of electricity to the rest of the electrical system. By following this diagram, you can wire your shovelhead motorcycle with ease.
Frequently Asked Questions
Q: Is it easy to wire a shovelhead motorcycle?
A: Wiring a shovelhead motorcycle is relatively easy, especially if you have a simple wiring diagram like the one shown in this article. However, if you’re not comfortable working with electricity, it’s always a good idea to have a professional mechanic do the work for you.
Q: Do I need any special tools to wire my shovelhead motorcycle?
A: No, you don’t need any special tools to wire your shovelhead motorcycle. However, you will need basic tools like wire cutters, crimping pliers, and a soldering iron. If you don’t have these tools, they can be purchased at any hardware store.
Q: Can I use this wiring diagram for other types of motorcycles?
A: No, this wiring diagram is specific to shovelhead motorcycles. However, many other types of motorcycles have similar wiring diagrams, so you may be able to adapt this diagram for your specific motorcycle.
Q: Can I modify the wiring on my shovelhead motorcycle?
A: Yes, you can modify the wiring on your shovelhead motorcycle, but it’s important to do so carefully and with a good understanding of electrical systems. If you’re not sure what you’re doing, it’s always best to have a professional mechanic do the work for you.
Q: Where can I find more information about wiring my shovelhead motorcycle?
A: There are many resources available online and in print that can help you learn more about wiring your shovelhead motorcycle. The Harley-Davidson service manual for your specific model is a good place to start, and there are also many forums and websites dedicated to vintage Harley-Davidson motorcycles.
Conclusion
Wiring your shovelhead motorcycle doesn’t have to be a difficult or confusing task. With a simple wiring diagram like the one shown in this article, you can wire your motorcycle with ease. Just remember to work carefully and follow the diagram closely, and you’ll be enjoying your vintage Harley-Davidson in no time.
