Title says it all. The battery light is on but the alternator is charging. Output is at 13.5 volts. Alternator is about 2 years old got a reman from Napa it appears to be in good shape. Battery appears good with a voltage of 12.7 when off. No starting problems and no dead battery issues. I checked the air intake temp sensor and the connection is good. The problem appeared at the beginning of summer after I charged the AC system. When I was checking the AC I disconnected the ac clutch wire to see if it was the problem with the AC. Anyway doubt it has any thing to do with it just looking for ideas. Thanks.