Car battery light ON and then OFF on 1993 Toyota Camry

While I was driving last night about 90 Km/hr suddenly I saw the battery light on. It stay about 4-6 minutes and then disappear. I was scared coz I need to drove about 30 more kms to home and I did it. That time headlight, gps and radio is operating but I switched off radio. would u plz let me know what should i do and cause of this problem.

by in Wake Island, HI on January 26, 2014
1 answer 5 comments
ANSWER by , January 26, 2014
That mean it not charging if it stays on or the voltage regulator starting to go see if its charging by checking battery with Volts meter ,should be 14.0 volts with car running...
COMMENT by , January 26, 2014
I also drove today morning...no problem till now. is it safe to drive
COMMENT by , January 26, 2014
Yes ,its safe just get it checked out if stays on ':-)
COMMENT by , January 26, 2014
but if it turn on then why suddenly again turned off....
COMMENT by , January 26, 2014
Becausee the voltage regulator is in alternator ,I thin k it could be on its way out..
COMMENT by , January 26, 2014
thanks dude. do you suggest me to replace it? how expensive it is?