1. Locate the starter solenoid. On the Polaris 400, the starter solenoid is located on the right side of the engine, just below the spark plug.
2. Look for a loose or damaged connection. Check the wiring harness for any loose or damaged connections. If you find any loose connections, tighten them. If you find any damaged wires, repair or replace them.
3. Test the solenoid. To test the solenoid, you will need a multimeter. Set the multimeter to read volts DC. Connect the positive probe of the multimeter to the positive terminal on the solenoid and the negative probe to the negative terminal. If you get a reading of 12 volts, then the solenoid is getting power.
4. If the solenoid is not getting power, the problem may be with the ignition switch. To test the ignition switch, turn the key to the "On" position. If you hear the fuel pump run, then the ignition switch is working. If you do not hear the fuel pump run, then the ignition switch may be faulty and will need to be replaced.
If you are still having problems with your Polaris 400 starter, you may need to take it to a qualified mechanic for diagnosis and repair.
