Low voltage after pulleys?

Yes, put the stock alternator pulley back on. That will help SOME.

LJH

....And put the stock alternator pulley on a 130A alternator.

Don M.

dG

Depends. Did everything work fine before swapping pulleys? If so, then you need to go back to the stock ones. You could go to a larger amp rating on the alternater. But why would you? The whole point of the new pulleys was to increase available power by decreasing parasitic drag from crank driven accessories. You could spend $100 or so and get the power pulleys, and then spend another $150 for the the high amp alternator, and you're right back where you started from. Except your $250 poorer. If you were not putting out enough voltage before the swap, then going to the new pulley would just make things worse. You needed a bigger alternator to start with.

Would that really make a difference? Even if the alternator could make

Thanks for the tips, guys. Before the swap i was making plenty of juice, a hair over 14 volts w/o accessories, just under 13 at night with lights, electric fan, stereo, fuel pump. Tonight i put the stock alternator pulley back on and i'm good. 14 volts w/o, around 13 with stuff running. It dips a bit at idle, but i was doing some tuning and bumped the idle down a bit. Nothing i can't live with. I don't mind not having that pulley on, i needed a new set anyway. I was doing a swap with a different water pump, bracketry, etc. I switched everything to Mustang-style pump, flex-dan, brackets, etc, and the water pump pulley had a different bolt pattern.

Thanks for the advice!! Don W

Yep, and the 3G alt will help keep your battery charged a little better, but it does NOT fix it. I'd suggest the 3G upgrade and get a GOOD battery like an Optima or Stinger. I went through a battery a year even before I changed the pulleys, the Stinger I have now I have had for going on 3 years.