Why is the starter on a 2003 GMC Sierra not getting power?

The starter on a 2003 GMC Sierra may not be getting power due to several potential issues. Common causes include a dead battery, faulty ignition switch, or a bad starter relay. Additionally, corroded or loose connections in the wiring or a malfunctioning neutral safety switch can also prevent power from reaching the starter. It's important to perform a thorough electrical diagnostic to pinpoint the exact cause.