Harley Davidson motorcycles are known for their powerful engines and unique styling. One of the most important components of the Harley Davidson engine is the ignition system, which includes the coil. The coil is responsible for generating the spark that ignites the fuel mixture in the engine. In this article, we will discuss the Harley Davidson coil wiring diagram, how it works, and some of the common issues riders may encounter with the coil system.
What is the Harley Davidson Coil Wiring Diagram?
The Harley Davidson coil wiring diagram is a schematic representation of the wiring system that connects the coil to the rest of the motorcycle’s electrical system. The wiring diagram shows how the coil is wired to the ignition switch, starter relay, and other components. Understanding the wiring diagram is essential for diagnosing and troubleshooting any issues with the coil system.
There are several different coil wiring diagrams used on Harley Davidson motorcycles, depending on the year and model. Some models have a single coil, while others have multiple coils. The wiring diagrams may also vary depending on whether the motorcycle has a magneto or battery-powered ignition system.
How Does the Harley Davidson Coil System Work?
The Harley Davidson coil system works by converting the 12-volt electrical power from the battery into a high-voltage spark. The coil contains two coils of wire that are wrapped around an iron core. When electrical power is applied to the primary coil, it generates a magnetic field. When the power is turned off, the magnetic field collapses and induces a voltage in the secondary coil, creating a high-voltage spark.
In a Harley Davidson motorcycle, the coil is connected to the ignition switch, which allows the rider to control when the spark is generated. When the rider turns on the ignition switch, power is supplied to the coil. When they press the starter button, power is also supplied to the starter relay, which engages the starter motor and cranks the engine. Once the engine is running, the coil continues to generate sparks to keep the engine running smoothly.
Common Issues with the Harley Davidson Coil System
Like any component in a motorcycle, the coil system can develop issues over time. Some of the most common issues include:
- Failed coil: The coil can fail due to age, damage, or other issues. When the coil fails, it may not generate a spark, or the spark may be weak or intermittent.
- Bad connections: The wiring connections to the coil can become corroded or loose over time, which can affect the coil’s performance.
- Failed ignition switch: If the ignition switch fails, it may not supply power to the coil, preventing the engine from starting.
How to Troubleshoot the Harley Davidson Coil System
If you are experiencing issues with your Harley Davidson coil system, there are several steps you can take to troubleshoot the problem:
- Check the connections: Make sure all the wiring connections to the coil are clean, tight, and free of corrosion.
- Test the coil: Use a multimeter to test the coil’s resistance and voltage output. If the readings are outside the manufacturer’s specifications, the coil may need to be replaced.
- Test the ignition switch: Use a multimeter to test the ignition switch’s continuity and voltage output. If the switch is not working correctly, it may need to be replaced.
FAQ
1. What is the purpose of the Harley Davidson coil?
The coil is responsible for generating the high-voltage spark that ignites the fuel mixture in the engine. Without the spark, the engine will not run.
2. How many coils does a Harley Davidson motorcycle have?
The number of coils varies depending on the year and model of the motorcycle. Some models have a single coil, while others have multiple coils.
3. How do I know if my coil is failing?
If your coil is failing, you may experience issues such as a weak or intermittent spark, difficulty starting the engine, or poor engine performance.
4. Can I replace the coil myself?
Replacing the coil requires some electrical knowledge and basic tools. If you are not comfortable working with electricity, it is recommended to have the coil replaced by a professional mechanic.
5. What are some signs of a bad ignition switch?
Some signs of a bad ignition switch include difficulty starting the engine, the engine cutting out while driving, or accessories such as the radio or lights not working.
| Year/Model | Coil Type |
|---|---|
| 1999-2003 Dyna | Dual fire coil |
| 2004-present Dyna | Single fire coil |
| 1999-2006 Softail | Dual fire coil |
| 2007-present Softail | Single fire coil |
| 1999-2006 Touring | Dual fire coil |
| 2007-present Touring | Single fire coil |
