2003 Chevrolet Cavalier Car 2 2 4 Cyclinder Will Start Runs Good Until You Turn

Have ALT output checked

Have the charging system professionally load-tested. The typical generator is designed to develop up to 90 amps. If all you can get is exactly one third of that, and "ripple" is very high, it has a defective internal diode. To prevent a lot of repeat failures, replace the battery at the same time unless it is less than about two years old.