89 Civic SI charging system question

I have a 1989 Civic SI (134000 miles) that I need some help with. When I first start the car up the "check charging system" light (the little battery) comes on and stays on for 15-20 seconds and then go out ans stays out for the rest of the time the car is running. Do I have an alternator problem or is there something else wrong. The battery is a liitle over a year old and the car starts up quickly. Any help?. Thanks/Greg

yo wuzzup, u should be fine.. u say the light shuts off after a little while right?... well if so u should be all good, i dont see a reason why not??... if the light one day does stay on then get it to a mechanic asap.. not stuff to be messin with man, but ya if u figure it out gimmie a holla, lates.