My cars seems to be having some issues with charging lately.the voltmeter in the dash only reads like 12-13 volts when idling and today for the first time I had to get a jump.I thought that the low voltage at idle was attributable to the u/d pullies but now im thinking that my battery is shot also.With the pullies im only using the crank and the water pump.I was idling a long time today while I was charging my A/C and I think that put it over the edge to where the batt was really ran down.Im thinkin of trying some stock pullies however I didnt get em with the car just the U/Ds but I swapped out the alt lately and that alternator had a smaller pulley on it, but it didnt really make any difference.