I replaced my original 35 amp alternator with a much larger capacity one. Defender had a sale on a Balmar alternator with an external regulator. With so much more drain (refrigeration, computer, MFD, etc.) it was a no brainer to make the change. My engine is a 3GMF (20 hp).
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Sun, Aug 13, 2017 at 3:09 AM, Matti Airas via CnC-List < cnc-list@cnc-list.com> 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 >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.paypal.me_stumurray&d=DwMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=9w3G7Cf8YfQnrjmtuNxwDJYr3JMv9f1pAfgAJ9xXYQQ&m=ejIS-UCaAaSoknaZUODawImRE-y2-L_jdeVgiF7MF_E&s=tJQNZm6Vig-vkkbEeXNwkaLm1IyIRjhW7bpNdc23dEk&e=> >> >> 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://urldefense.proofpoint.com/v2/url?u=https-3A__www. > paypal.me_stumurray&d=DwICAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN > 0H8p7CSfnc_gI&r=9w3G7Cf8YfQnrjmtuNxwDJYr3JMv9f1pAfgAJ9xXYQQ&m=ejIS- > UCaAaSoknaZUODawImRE-y2-L_jdeVgiF7MF_E&s=tJQNZm6Vig- > vkkbEeXNwkaLm1IyIRjhW7bpNdc23dEk&e= > > All Contributions are greatly appreciated! > > -- Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR
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