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On the Catalina 34 International Association Website there are some nice write ups on Electrical upgrades including information on a 100 amp Alternator that will bolt right right on your engine with a single belt pulley. The alternator was built by a small outfit in either Minnesota or Wisconsin and cost about $120. Search for key words "Blue Circle" to find one of the discussions. Along with your higher capacity alternator, you'll want to buy a fancy three stage smart regulator. The regulator alone is an improvement over the stock dumb regulator in your current alternator.
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