the pointy end is the bow
Join Date: Aug 2006
Location: La Conner, Washington
Thanked 26 Times in 26 Posts
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Does the alternator have a standard sized looking pulley on it? If it does, frankly, I don't think it's that critical. The voltage regulator will regulate the voltage at varying rpms and the alternator is only rated at a particular amperage anyway. The alternator actually works less for a given amount of power when running at a faster speed, so unless it has a grossly oversized or undersized pulley I think you'll be fine.
edit: I just drew out two pulley senarios on paper to see the end result while using an intermediate pulley, and I don't see a change in the end result. The pulley in the middle doesn't matter, it's the size of the crankshaft pulley and the alternator pulley at the end that determines how fast your alternator spins.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.
Last edited by erps; 04-09-2010 at 04:36 PM.