Battery Discharged

Battery discharged

Check for a poor connection at the battery terminal.

Test the battery Testing and Inspection.

Troubleshoot the alternator and regulator circuit Alternator and Regulator Circuit Troubleshooting.

Check for a broken drive belt:

'08-10 models J35Z2 engine

Except '08-10 models J35Z2 engine Testing and Inspection

Check the drive belt auto-tensioner:

'08-10 models J35Z2 engine

Except '08-10 models J35Z2 engine Testing and Inspection

Check for excessive parasitic electrical current draw with the ignition switch in LOCK (0), and the key removed. The multiplex control unit may take up to 10 minutes to turn off (sleep mode) for some models.

'11 model J35Z2 engine: Check for a broken over-run alternator decoupler (OAD) pulley