i have a 2000 civic si, and my problem is that my car has been havin this problem lately.
my battery meter will start off @ 12v then it gradually drops down to about 9v and some times the car shuts off.
but if i rev the car the battery meter goes up & everthings good.
and i just bought a optama yellow top battery
i have a feeling its my alternator but dont know for sure
oh yea i got a 1200watt rms system on the factory alternator
could that be my problem?