Join Date: Feb 2010
Location: Narragansett Bay
Thanked 574 Times in 550 Posts
Rep Power: 11
Re: Electrical problem, alternator replacement, bracket upgrade, now exhaust coolant
The tach should read lower rpms, but it's normal for an alternator to provide very little to no charging at too low an rpm. At anchor, if you use your main engine to charge batteries (in neutral of course), you typically have to juice up the rpms to 40ish % of max.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.