The small diameter pulley is going to be needed to make the alternator start charging on startup. It spins the rotor faster and gets the charging started sooner. With the bigger pulley you will need to goose the throttle after starting to get the amps flowing. Search "2-groove alternator pulley" on Ebay. There are at least 20 of them listed today. Install the 2 groove small diameter pulley and use the front groove, and things will line up right. I use an impact wrench and a 15/16" socket to install/remove those pulleys.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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