If your solenoid is not working, please:
- Inspect all connections from batteries to solenoid and power harness, and ensure the solenoid is grounded.
- Check the voltage of the main battery at the solenoid to ensure it is above 9 VDC.
- Turn the vehicle ignition to the RUN position and check the voltage by placing the positive lead on the positive signal post, and place the negative lead on the negative signal post of the solenoid. If the battery voltage exists and the solenoid does not engage, the solenoid is defective.