Do you happen to have a part number for the smaller pulley, or its dimensions etc?

Or maybe I can change the pulley on my alternator?

I can't seem to find the information about the pulley dimensions. If I can't find that info, I guess I'll be taking measurements of my pulley tonight and try to look up online and find a pulley that will fit but is smaller <img src="/forums/images/graemlins/kewl.gif" alt="" />

I THINK that the stock pulley is about 2.5" in diameter but I don't know the size of the shaft and other information that I'd need. I also am not sure what the main drive pulley size is on the engine.

I was reading that if the idle speed is 800 RPM then you want the pulley ratio to be at least 3:1 so tthat the alternator can spin at 2400 RPM, so it can keep up with electrical system demands.

I bet the stock Sportage alternator ratio is lower than 3:1? That could explain the problems I'm seeing. I mean, it doesn't matter if your alternator is capable of 140 amps or 70 amps or 30 amps, if you're not spinning it fast enough it won't supply anywhere near that much. I'll find out tonight!