CDI or Capacitor Discharge Ignition is an electronic ignition system used in internal combustion engines, especially two-wheelers. It replaces the conventional breaker points ignition system with a solid-state digital module.
The 6 pin AC CDI is the basic CDI that is widely used in small engines or scooters. In this article, we will discuss the 6 pin AC CDI wiring diagram in detail. We will go through the components of the CDI and their functions, the wiring connections, and the FAQ related to it.
Components of 6 Pin AC CDI
The 6 pin AC CDI consists of the following components:
| Component | Function |
| Trigger | Generates a signal that triggers the CDI to produce a spark |
| CDI box | Stores energy and releases it to the ignition coil to produce a spark |
| Ignition coil | Transforms the low voltage from the battery to high voltage required for a spark |
| Spark plug | Produces a spark that ignites the fuel-air mixture |
Now let’s look at the wiring connections of these components.
Wiring Connections of 6 Pin AC CDI
The wiring diagram of the 6 pin AC CDI is shown below:
The following are the wiring connections:
| Wire Color | Function |
| Black/Red | Ignition coil positive |
| Black/White | Ignition coil negative |
| Green | Ground |
| Blue | Trigger |
| Yellow | AC power out to the headlight |
| Red | Battery positive |
The trigger wire should be connected to the pulse generator or the stator coil of the engine, which generates a signal every time the engine completes a revolution. The blue wire should be connected to the trigger wire.
The ignition coil positive and negative should be connected to the black/red and black/white wires, respectively. The green wire is the ground wire and should be connected to the frame of the vehicle.
The yellow wire is the AC power out wire that provides power to the headlight or other accessories. The red wire is the battery positive wire and should be connected to the positive terminal of the battery.
FAQs
1. What happens if the wiring connections are incorrect?
If the wiring connections are incorrect, the CDI may not function properly, or it may cause damage to the CDI, ignition coil, or other components. It is important to follow the correct wiring connections mentioned in the wiring diagram.
2. How do I test the CDI?
The CDI can be tested using a multimeter or an ignition tester. The resistance between the ignition coil positive and negative should be around 0.5 ohms. If the resistance is too low or too high, the CDI may be faulty.
3. How do I troubleshoot a CDI?
If the engine does not start or runs poorly, the CDI may be faulty. To troubleshoot, check the wiring connections, spark plug, ignition coil, and the CDI itself. If all of these are working properly, the CDI may need to be replaced.
4. Can I use a 6 pin AC CDI on a DC system?
No, the 6 pin AC CDI is designed for AC systems only. Using it on a DC system may damage the CDI.
5. Can I replace the 6 pin AC CDI with a different type of CDI?
Yes, it is possible to replace the 6 pin AC CDI with a different type of CDI. However, you need to make sure that the new CDI is compatible with your engine and wiring system.
In conclusion, the 6 pin AC CDI is a basic CDI used in small engines or scooters. It has a simple wiring diagram with six wires that need to be connected correctly for it to function properly. Follow the correct wiring connections and perform regular maintenance to ensure the CDI lasts long and performs optimally.
