Possible Causes of No Electricity to the Coil:
* Dead Battery: The most common cause is a dead battery. Make sure your battery is fully charged. A weak battery might start the engine, but won't provide enough power for the coil.
* Faulty Battery Connections: Loose or corroded battery terminals can prevent current flow. Check and clean the terminals.
* Blown Fuse: A blown fuse in the ignition circuit will cut off power to the coil. Check the fuse box for a blown fuse.
* Faulty Ignition Switch: The ignition switch may be malfunctioning and not sending power to the coil. Try wiggling the ignition switch while the engine is running to see if it affects anything.
* Broken or Corroded Wires: Check all wiring going to the coil and from the battery for broken or corroded wires.
* Faulty Ignition Coil: The coil itself could be faulty and not receiving or delivering power properly. You can test this with a multimeter.
* Faulty CDI (Capacitive Discharge Ignition) Unit: The CDI unit is responsible for triggering the spark. A faulty CDI unit can prevent the coil from receiving the signal to create a spark.
Troubleshooting Steps:
1. Check the battery: Make sure it's fully charged and connections are clean and tight.
2. Check the fuses: Inspect all fuses related to the ignition system.
3. Inspect the wiring: Check for any broken or corroded wires, especially near the coil, battery, and ignition switch.
4. Test the ignition coil: You can use a multimeter to test the coil's resistance. If it's out of spec, replace it.
5. Test the CDI unit: This can be tricky, but you can try replacing it if you suspect it's faulty.
Important Notes:
* Safety First: Disconnect the battery before working on any electrical components.
* Use a repair manual: A service manual for your Yamaha Grizzly will provide specific troubleshooting steps and wiring diagrams.
* Seek professional help: If you're not comfortable troubleshooting electrical issues, it's best to take your ATV to a qualified mechanic.
By carefully following these steps and referring to your service manual, you can narrow down the cause of the problem and potentially resolve the issue. Good luck!
