How do you know if you have a bad solenoid or a bad starter?

To determine if you have a bad solenoid or a bad starter, you can perform a simple diagnostic test. If you hear a clicking sound when you turn the ignition but the engine doesn't crank, the solenoid may be At Fault. Conversely, if the solenoid clicks and you hear the starter motor running but the engine still doesn’t turn over, the starter itself might be the issue. Additionally, checking for voltage at the starter while attempting to start the vehicle can help pinpoint the problem.