why do my high voltage light keep coming on on 1994 Cadillac DeVille

when ever im driving the car my high voltage light comes on each time it do it blow out somthing in the car blow motor, lights, radio and other things what do i need to fix or repair to stop this problem.

Asked by for the 1994 Cadillac DeVille
try to check your alternator and battery.your local parts store will test them for free.