Thanks matti and graham- Seems like a fairly routine failure, and it looks like I can order a replacement fairly inexpensively and then rebuild the existing as a spare. Any sort of upgrade seems to be of limited benefit. Added to my project list: convenient test probe sockets for each bank to plug in a vom for troubleshooting purposes. Thanks Dave.
Sent from my iPhone > On Aug 13, 2017, at 6:09 AM, Matti Airas <mai...@iki.fi> wrote: > > 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! >
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