
Posts: 2754
Location: Mauston, Wisconsin | Castle Rock Marine has pretty good service..
http://www.castlerockmarine.com/service.html
This is the electrical charging system.
http://boatinfo.no/lib/mercury/manuals/50-60.html#/104
However it doesn't show this diode harness.. -> see #27
http://boatinfo.no/lib/mercury/manuals/50-60.html#/104
Its probably a blocking/reverse polarity diode to protect the regulator. If so it could be your problem, e.g., if its open....
Does your tach work? If not, its the stator charging coils or the regulator.
Good luck!
Al
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