The alternator may fail causing the battery to go dead. The charge light on the dash may or may not illuminate. The alternator may also develop an abnormal noise. A failed alternator will require replacement.Google+
Car Problem Reports
Chevrolet Express 3500 Alternator May Fail and Cause Noise and Dead Battery
Chevrolet Express 3500 Problem
Engine Affected: 5.7L V8
Visitor, 2000 Chevrolet Express 3500, 5.7L V8
Man, this DID happen to us! More than once! Once we changed the alternator, no problems!
Noisy broke down twice on the highway put some oil in it thinking it was the problem now believing it's the alternator