How do you know if a starter or starter solenoid is bad in a 2000 GMC Sierra 1500?

To diagnose a bad starter or starter solenoid in a 2000 GMC Sierra 1500, listen for a clicking sound when turning the ignition; a single click often indicates a faulty solenoid, while no sound could suggest a bad starter. Additionally, check for voltage at the starter terminals using a multimeter; if there’s power but it doesn’t engage, the starter is likely faulty. Inspect the battery and connections as well, since poor connections can mimic starter issues. If necessary, you can also perform a bench test on the starter to confirm its condition.