[Blaiser17]

I have 2 batteries in my car for extra accessories (subs, lights, etc.) I'm pretty sure the alternator in there is stock. The front battery keeps losing voltage little by little when the car is runnin. The battery is fine though, it holds a 12 volt load, and the back battery is wired in parallel connection with the front battery so there are double the amps, but still 12 volts. I'm guessing the stock alternator can't pump out enough amps to both batteries...simply because it's stock. I went down to advanced auto and they only knew of 2 alternators which I could put in my car, and I already had the one and the other one wasn't much more powerful. Does anyone know where I can find an aftermarket alternator that I can use in this car, and it'll be powerful enough?