my GMC Sierra won't start just clicks what to do

Learn how to diagnose and fix a GMC Sierra that won't start and only clicks. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and materials needed for the repair.
• Tools Required: Multimeter, socket set, jumper cables, wrench set, remote starter switch.
• Safety Warnings: Disconnect the battery before working on the electrical system.

2. Battery Inspection and Replacement

1. Inspect and Clean Battery Terminals

   • Remove the negative (-) terminal first, followed by the positive (+) terminal.
   • Clean corrosion from terminals using a wire brush and a mixture of baking soda and water.
   • Reconnect the positive terminal first, then the negative terminal.

2. Test and Replace Battery (if necessary)

   • If the battery voltage is below 12.4 volts, charge the battery.
   • If it fails to hold a charge or is below 12.0 volts after charging, replace the battery.
   • Dispose of the old battery properly.

3. Starter Inspection and Replacement

1. Check Starter Connections

   • Ensure that the starter wires are securely connected and free of corrosion.
   • Tighten any loose connections.

2. Test Starter Motor

   • If the starter is suspected of failure, remove it from the vehicle.
   • Use a remote starter switch to apply voltage directly to the starter to check for operation.

3. Replace Starter Motor (if necessary)

   • If the starter does not engage, replace with a new starter motor.
   • Follow manufacturer’s torque specifications for securing the starter bolts.