do they make an overdrive alternater pulley
I been looking at the voltage and it drops pretty low with my flex fans a/c and inline fuel pump going roll down the windows and there really slow
and side effects to a pulley like this to the alternator
Or should i get a bigger alternator ?

jim

 

540120
ASP OVERDRIVE ALTERNATOR PULLEY

This is the one I have. Yes it helps and won't negate the underdrive pulley's gain.

 

will i need a new belt for that pulley?or it's ok with my belt ?

 

I used the same belt. You will have to change the belt with the larger pulley, not the smaller one. This pulley is smaller than stock.