Standard alternator has in internal regulator. I'd disconnect from shore power and then run a load on the batteries - frig, 12 volt motor etc. Check voltage. Start engine, look for a jump in voltage.
Or I'd just pull the alternator and take it to be tested. Non OEM alternators are cheap. Joel On Mon, May 15, 2017 at 9:22 AM, Hoyt, Mike via CnC-List < cnc-list@cnc-list.com> wrote: > While out for a lovely day sailing Saturday we noted that the electric > head was not draining properly. When I checked it seems like the motor was > straining and may need replacement. Afterward when motoring back to our > club we noted some issues with wind instrument and then chart plotter. > Checking voltage meter revealed a reading of nothing on house bank and 13 > volts on starter battery. Back at dock with shore power connected and > charger on the voltage was over 12v and all systems and head functioning > normally. Next morning with Charging turned off the house batteries showed > full charge and all was working. > > > > A very quick check revealed no loose belts and alternator was at least > spinning. I was in the middle of a different project that had to be done > while it was not raining so left it there for now (installing new genoa > tracks). > > > > What is the best place to start? > > > > Engine is Yanmar 3GM30F > > > > Mike > > Persistence > > 1987 Frers 33 #16 > > Halifax, NS > > http://users.eastlink.ca/~mhoyt > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > -- Joel 301 541 8551
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