Hi, I just had a similar charging issue. The motor is a Yanmar 3gm30f. The alternator was not original. With Nigel Calder's "Boatowners Mechanical and Electrical Manual" (highly, highly recommended!) I was able to trace the issue to a faulty charging regulator. We weren't close to home at the time, so I had call in a boat electrician to have it replaced. He just replaced the old alternator with a little-used second-hand Hitachi one. Couldn't really be picky at that point.
As far as I understand, with ACRs, even any automotive charger from a car parts store would do, as long as it mechanically fits and the RPMs are in the correct ballpark. With your biggish house bank, you might want to get a slightly heftier alternator while at it. Cheers, Matti C&C 36 "Hurma" Helsinki, Finland On 13 August 2017 at 06:38, Dave via CnC-List <cnc-list@cnc-list.com> wrote: > Good evening all, > > A new one on me, my batteries no longer appear to be fully charging via > the alternator, while they do fully charge via shore power. Specifically, > the (new) start battery sees only 12.56v while the engine is running, this > is not sufficient to close the ACR, and the house bank (2 ea, also new, > group 31 @ 130a/h ea). therefore receives no charge at all. Surprise! > I believe this means the stock Hitachi 55a alternator is failing. > Any thoughts on this and any recommendations on a replacement alternator? > > Thanks! Dave. > > Windstar, 33-2 with yanmar 2gm20 > > > > Sent from my iPad > _______________________________________________ > > 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! >
_______________________________________________ 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!
