Thanks for the responses - I just spent a bunch of $ getting a new kicker motor, so I'm not excited about spending on a new alternator but I need the batteries in good shape - planning to start hitting the ocean and don't need any problems.
Spare - did you find the trouble shooting chart for the regulator? I do have the Merc factory shop manual but haven't had time to dig into it. About what is a reasonable cost for a kit, if I need to go that way and can I buy it from you and get it drop shipped to me on the left coast?
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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