38DD2436

I installed a 25% under drive pulley and now it seems that the battery is just barely keeping a charge. I'm thinking the belt isn't turning fast enough. Is there a larger pulley I can install on the alternator to make up for the size of the UD pulley? Is this a problem using ud pullies?

FirstYrLS1Z

iTrader: (4)

not a larger,but a smaller alternator pulley.
some underdrive pulleys are sold as a set including a alternator and water pump pulley.
here's some old threads for reference

https://ls1tech.com/forums/lt1-lt4-m...y-problem.html

https://ls1tech.com/forums/generatio...ey-yes-no.html

google 'underdrive pulley LS1'.

one fast zo6

iTrader: (490)

alternator might be just week.

38DD2436

Its a new new alt. 100 amp. Installed last year.