Testing a bad solenoid on a golf cart can be done by following these steps:

1. Identify the solenoid:

The first step is to identify which one of the two solenoids is faulty. You can do this by disconnecting the battery from the cart and using a multimeter set to ohms to test each solenoid individually. If you find one with an open circuit or an extremely high resistance reading, it's likely the faulty solenoid.

2. Disconnect the solenoid:

Once you have identified the bad solenoid, disconnect it from the rest of the system. This involves removing any connectors or fasteners holding it in place.

3. Apply power directly:

With the bad solenoid disconnected, apply power directly to the coil wires. Use a jumper wire or alligator clips to connect the positive (+) terminal of the battery to one end of the coil and the negative (-) terminal to the other end.

4. Check for magnetic action:

Observe if there is any magnetic action when the power is applied. A good solenoid should produce a strong magnetic field when energized. If no magnetic action is observed, it confirms that the solenoid is indeed faulty.

5. Replace the solenoid:

Once you've confirmed the solenoid is bad, replace it with a new one. Make sure to follow the manufacturer's instructions for installation and reconnection.

6. Test the new solenoid:

After replacing the solenoid, reconnect the battery and test the operation of the golf cart to ensure the new solenoid is functioning properly.

By following these steps, you can diagnose and replace a faulty solenoid on your golf cart.