There is a diode problem with the alternators. However if you're gauge does not drop it is more likely a battery or battery cable/terminal issue. If you're battery is just say 100 cranking amps low the light will flicker off and on randomly.
Mine does it too.
I replaced the terminal cables and got no difference.
Definitely do the negative terminal disconnect and see what happens.
If the car starts reliably, you're probably fine.
Mine's been doing it for a while and I just gave up and deal with it.
If you can, grab a buddy's battery for a day and see if the light flickers still, if it does then you likely have a bad ground.
i bought the battery last year and still have the original alternator with 98,000 miles on it, going to clean terminals and check for loose connections this afternoon, if that doesent fix it i will get an alternator this weekend, thanks for the replies
Mine was doing it. 04 GT vert. While I was install a stereo we redid my terminals and did a ten amp charge for two hours. It has been off for almost a week now with more load on the alt. my alt and battery passes load test. Battery showed about 90 cranking amps low. Never slow cranked or anything. I really think it is either the battery or was the batt connections. Car has 100000 miles. Good luck with yours.