Alternator pulley Question

[wlaukaitis]

Hi

I just put a rebuilt alternator on my '86 yesterday. The pulley that is on the alternator is smaller (2.25") than what was on the original (2.5"). The alternator is stamped 120A

I left the one that came with it (the new alternator) on it and installed it that way.

So, I get 13.9 volts at idle which is ok with me but should I change it, I do not know if it is underdrive, nor do I need underdrive.

Correct me if I am wrong but a smaller driven pulley (the Alt pulley) will turn the alternator faster?!

Thanks,
Bill

 

[turbocody]

yes, the smaller pulley will spin faster.but stock is 140amps i believe so double check that alt.

 

[DR BOOST]

stock is 120

 

[wlaukaitis]

So should I change the pulley or leave what is on there?

Could someone measure the pulley they have?

Thanks!
Bill

 

[DR BOOST]

leave it on...it will be fine.

surej