1. Dead or weak battery. Check the battery voltage with a multimeter. If the voltage is below 12.6 volts, the battery may need to be recharged or replaced.
2. Loose or corroded battery connections. Clean the battery terminals and cable connections and make sure they are tight.
3. Faulty starter relay. The starter relay is responsible for sending power to the starter motor. If the relay is faulty, it will not be able to send power to the starter motor, and the engine will not start.
4. Faulty starter motor. The starter motor is responsible for turning the engine over. If the starter motor is faulty, it will not be able to turn the engine over, and the engine will not start.
5. Damaged wiring. Check the wiring harness for any damage that could prevent the electric start from working.
If you are unable to identify and fix the problem yourself, you can take your Grizzly to a qualified mechanic for further diagnosis and repair.