Harley Single Fire Coil Wiring Diagram

By | February 19, 2023

A single fire coil is an ignition component used in some engine systems. It is used to provide an efficient spark for combustion of the fuel/air mix in the cylinder. While the single fire coil provides improved efficiency when compared to older, stock ignition systems, its installation and wiring are more complex than a dual fire coil system.

The main purpose of the single fire coil is to create a more efficient spark. This is done by firing both spark plugs simultaneously rather than firing one after another like in a standard, dual fire coil system. This allows the engine to produce more power. In addition, a single fire coil also creates a more consistent spark which can improve fuel economy.

The single fire coil is installed between the ignition switch and the spark plug wires. The wiring harness is then plugged into the coil's external terminal. The terminal is then connected to the positive side of the battery. This connection provides the power needed for the coil to generate the spark.

Advantages of Single Fire Coil

Using a single fire coil in place of a dual fire coil can provide several advantages. First, because it fires both spark plugs at the same time, it produces a more powerful spark. This can help to improve engine performance and fuel efficiency. Secondly, single fire coils provide a more consistent spark which can help to reduce misfires. Finally, single fire coils are smaller than dual fire coils which makes them ideal for tight engine compartments.

Single fire coils can be used with stock ignition systems. This is done by rewiring the existing ignition system so that it is compatible with the single fire coil. This process can be tricky, however, and should only be attempted by experienced mechanics or those with the proper knowledge of the system.

How to Wire a Single Fire Coil

Once the single fire coil has been installed, it must be wired correctly in order for it to work properly. This is done by connecting the red wire from the coil to the positive side of the battery. The other wires from the coil must then be connected to their respective components. For example, the black wire is connected to ground and the yellow wire is connected to the ignition switch. The white wire is then connected to the spark plug wires.

When wiring a single fire coil, it is important to ensure that all connections are properly made and that the correct resistance is being used. The resistance value for a single fire coil should be between 5 to 10 ohms. Using too high of a resistance can cause the coil to overheat while using too low of a resistance can cause the coil to become damaged.

Common Issues with Single Fire Coil Wiring

When wiring a single fire coil, it is important to be aware of some common issues that can occur. One common issue is the use of incorrect resistance values. This can lead to the coil becoming damaged or overheating. In addition, incorrect wiring can lead to problems such as weak sparks or misfires. Another common issue is failing to connect the ground wire correctly. If this wire is not connected properly, the coil may not function correctly.

Troubleshooting Tips for Single Fire Coil Wiring

When troubleshooting single fire coil wiring issues, it is important to first check the resistance value of the coil. This can be done with an ohmmeter. If the reading is too high or too low, the coil may need to be replaced. Additionally, it is important to make sure that all of the connections are properly made. This includes checking the ground wire and making sure that the wire harness is plugged into the correct terminals. Finally, it is important to check for any loose or broken wires. If any of these issues are present, they must be taken care of before the single fire coil can be used properly.

Overall, single fire coils can provide significant benefits when compared to standard dual fire coils. They provide a more powerful spark which can improve engine performance and fuel economy. It is important, however, to properly install and wire a single fire coil in order for it to work properly. By understanding the proper procedures for installing and wiring the coil, as well as familiarizing oneself with some of the common issues that can arise, one can ensure that their single fire coil will be up and running without any problems.


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