Battery light question

[madbouncy]

'93 coupe, stock stereo and everything

My battery light comes on when it gets kind of cold out. So pretty much every night the battery light is one while I'm driving but a lot of times during the day it's not, that or it's just too faint to make out. It dims as I get closer to idle but if the higher I rev the brighter it gets, once I go above 3k it starts blinking really fast and at like 5k my dash starts flickering. I took it to the shop and they tested the alt and battery and said everything was fine, even under heavy load. The guy just said the belt was probably wet and was slipping at higher rpms. So anybody have any ideas? I hope it's just a bad connection and not something actually broken. I did search, but all the stuff I saw was the opposite of mine, when they revved their light went off, where as mine gets brighter.

Thanks for your time.
Modified by madbouncy at 10:57 PM 11/13/2004