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 G Series Van (G20) Alternator May Fail and Cause Noise and Dead Battery
Chevrolet G Series Van (G20) Problem
Engines Affected: 5.7L V8, Gasoline
Visitor, 1990 Chevrolet G Series Van (G20), 5.7L V8, 130,000 mi
I just purchased this van. It took an alternator and radiator so far and ac is not working. Engine also runs rough, we are diagnosing.