Voltage Problem 2000

Recenlty I have had some voltage drops fluctuating on the battery indicator. I had the battery and alternator tested several times and they check out ok. Would anybody have any ideas, comments on some solutions where I could look for the cause. Some tell me its a sensor/relay, or something small as an eletrical short. Any help would be appreciated. Thanks

Your car is fairly new. I'd take it in to the dealer and get it checked. It might be an internal alternator problem. Good Luck.