This is topic Underdrive pullies in forum Tech Talk at Northern California Ford Owners  .


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Posted by slow5oh (Member # 12881) on :
 
so I put some underdrive pullies on today and when I idle at a stop light my voltage drops a little. Not really concerned but I wanna know if there's anything I could do about it?
 
Posted by sleeping stallion (Member # 8162) on :
 
I think it's because u changed the alt pulley someone will correct me
 
Posted by SLOW95GTS (Member # 10365) on :
 
That's the side effects of under drive pullies, so those 3hp makes the alternator work harder. I'd put the stock alternator pulley back.
 
Posted by LXjames (Member # 10791) on :
 
Compare your old and new alt pulley I would only run crank an wp under drive and even that will lower your charging volts. Switch it back see if it helps an if you didn't change it at all it's probably a weak alternator that's been even more weakend by the now slow rotation of your accessories
 
Posted by slow5oh (Member # 12881) on :
 
quote:
Originally posted by SLOW95GTS:
That's the side effects of under drive pullies, so those 3hp makes the alternator work harder. I'd put the stock alternator pulley back.
oh okay, thanks guys
 
Posted by slow5oh (Member # 12881) on :
 
quote:
Originally posted by LXjames:
Compare your old and new alt pulley I would only run crank an wp under drive and even that will lower your charging volts. Switch it back see if it helps an if you didn't change it at all it's probably a weak alternator that's been even more weakend by the now slow rotation of your accessories
when I swapped the alternator pulley they were the exact same size(I think cause I have a 3G alternator) but my volts didn't drop so much to where I should worry about it, just wanted to see if it was normal
 
Posted by LXjames (Member # 10791) on :
 
It's normal also you could raise your idle speed just a hair so it won't flutter with all your lights radio on at idle
 
Posted by SLOW95GTS (Member # 10365) on :
 
It's normal not a big deal until you add beat or other things that work off you battery/alternator.
 
Posted by slow5oh (Member # 12881) on :
 
sounds good, thanks guys
 




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