Visual/Physical Inspection

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for aftermarket devices which could affect the operation of the starting and charging systems. See CHECKING AFTERMARKET ACCESSORIES .
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.