Re: Generator pulley ID
The picture is to dark for me to see but it looks like it is keyed. This would make it for an early to mid 30's model or truck with a fan. It also is a large diameter as show by the fan mounting screw lugs. and your measurements Larger trucks used the larger pulley's so they wouldn't over charge the batteries. The later generators used a larger screw on pulley. G.M.
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