Hum, I. New to this boat and boats with diesel engines. Numerous times past couple weeks have turned key off without killing the engine. I have a 20gm. How do I know if I did damage? Check battery voltage while engine is running? Should be 13.5 or so?
Lorne Serpa C&C 30MKII 1988 Friendship, MD On Jul 20, 2016 12:50 AM, "Leslie Paal via CnC-List" <cnc-list@cnc-list.com> wrote: > Small correction: > "The sudden high > current overheats the diodes and they fail open" > When the battery is disconnected while the alternator is charging the > existing field current will generate a high voltage spike that exceeds the > reverse voltage breakdown value. Normal diodes are rated for 60-100V > reverse voltage. The spike can be lot more; depending how high was the > charging current (more>higher). The P/N junction will punch through, the > resulting localized current can make it open or short. > > Overloading forward (normal direction) current will heat the chip and the > carefully placed 'impurities' will migrate and make the diode a little or > lot leaky. Unless you fuse the internal connection, the open. > > Leslie. > Phoenix C&C32 1983 > > -------------------------------------------- > On Tue, 7/19/16, Josh Muckley via CnC-List <cnc-list@cnc-list.com> wrote: > > Subject: Re: Stus-List Relocating the Yanmar key now alternator.. > To: "C&C List" <cnc-list@cnc-list.com> > Cc: "Josh Muckley" <muckl...@gmail.com> > Date: Tuesday, July 19, 2016, 9:31 AM > > I have heard > all of this before and am still electrically confused. I > have a few theories but no proof. In the face of my > theories is the fact that it is not consistently > repeatable. So here goes. > Turn the battery off while running and the > alternator suddenly goes to full output kinda like shifting > to 1st while going 70mph. I get that. The sudden high > current overheats the diodes and they fail open. > Turn the key off while running and one of two > things happens. 1st option is that nothing about the > alternator is wired to the ignition and nothing happens. I > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! >
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