Are you planning to work on your motorcycle’s electrical system and looking for a comprehensive guide on 5 pin AC CDI wiring? Congratulations! You are in the right place. In this article, we will cover everything you need to know, from the basics of CDI to the wiring diagram, FAQs, and tables.
What is a CDI?
A Capacitor Discharge Ignition (CDI) is an electronic ignition system that stores a high-voltage charge in the capacitor and discharges it to the ignition coil in the required ignition timing. It converts low voltage DC into high voltage pulses to fire the spark plug.
A CDI system has three main components – a capacitor, a CDI box, and a coil. CDI systems are commonly used in motorcycles, ATVs, and small engines.
Types of CDI
There are two types of CDI – AC CDI and DC CDI. The primary difference between the two is the power source they use.
An AC CDI uses Alternating Current (AC) from the stator to charge the capacitor, while a DC CDI uses Direct Current (DC) from the battery to charge the capacitor. In this article, we will focus on the wiring diagram of 5 pin AC CDI.
Components of 5 Pin AC CDI
A 5 pin AC CDI has five wires – black, blue, yellow, green, and red. Each wire has a specific function:
| Wire Color | Function |
|---|---|
| Black | Ground |
| Blue | Pickup Coil |
| Yellow | Spark Plug |
| Green | Ground |
| Red | Battery Positive |
Black Wire (Ground)
The black wire is the ground wire and should be connected to the frame or engine’s grounding point.
Blue Wire (Pickup Coil)
The blue wire connects the CDI box to the pickup coil. The pickup coil generates AC voltage as the engine rotates, which is sent to the CDI box through this wire.
Yellow Wire (Spark Plug)
The yellow wire connects the CDI box to the spark plug. The high-voltage pulses generated by the CDI box are sent to the spark plug through this wire, creating the spark that ignites the fuel mixture.
Green Wire (Ground)
The green wire is the ground wire and should be connected to the frame or engine’s grounding point.
Red Wire (Battery Positive)
The red wire connects the CDI box to the battery’s positive terminal. It provides power to the CDI box and allows it to charge the capacitor using AC voltage from the pickup coil.
5 Pin AC CDI Wiring Diagram
The following diagram shows the wiring connections for a 5 pin AC CDI:
Follow the steps below to connect the CDI:
- Connect the black wire to the frame or engine’s grounding point.
- Connect the blue wire to the pickup coil (usually located in the stator).
- Connect the yellow wire to the spark plug.
- Connect the green wire to the frame or engine’s grounding point.
- Connect the red wire to the battery’s positive terminal.
Make sure all connections are tight and secure. Any loose connection can result in a malfunctioning CDI, which can damage the engine.
FAQs
Q. What happens if the CDI is not grounded properly?
A. If the CDI is not grounded properly, it may not function correctly, resulting in a weak spark or no spark at all. It can also damage the CDI system or even the engine.
Q. Can I use a DC CDI on an AC system, or vice versa?
A. No, you cannot use a DC CDI on an AC system, or vice versa, as the power sources are different, and the CDI system is designed to work with a specific type of power source.
Q. Can I test the CDI to check if it’s working correctly?
A. Yes, you can test the CDI using a multimeter or an ohmmeter. Follow the instructions provided by the manufacturer to conduct the test.
Conclusion
Understanding the wiring diagram of a 5 pin AC CDI is essential for anyone working on their motorcycle’s electrical system. Make sure to follow the instructions carefully and double-check all connections to avoid any damage to the CDI system or the engine. If you have any doubts or questions, refer to the manufacturer’s manual or consult a professional mechanic.
