1985 Chevy Camaro ALT lite on

Hey guys im having a strange problem with my alt. Lite in my 85 camaro that hopefully someonecan help me with. For over the last 15 months the alt lite has been on almost constantly without the battery ever going down.A couple of times the lite would go off momentarily then goes right back on.I've checked the voltage numerous times and always reads between 14.1-14.5 volts. The car has about 300k miles, belt is in good shape and tight, alt. Is about 7 years old I appreciate any ideas someone might have.
rustybutch