Re: Stus-List blown alternator diode

[Dr. Mark Bodnar via CnC-List]

I read that here on an earlier C&C thread - but I thought that you could switch between 1 - both - 2 without a problem - just don't flip through the "off" position. I did find a MaineSail article on SailBoat Owners where he describes re-wiring the switch so that the alternator charge is going directly back to the battery and avoids the risk of the switch rotating through the off position. Mark There is no cure for birth and death save to enjoy the interval. - George Santayana On 15/08/2014 10:34 AM, Jerome Tauber via CnC-List wrote: The most common cause of diode failure on older boats is turning the battery 1-2-all switch while the engine is running.  This causes a brief period of no load on the alternator and blows the diodes.   Jerry C&C 27 V -----Original Message----- From: Jack Fitzgerald via CnC-List <cnc-list@cnc-list.com> To: Burt Stratton <bstrat...@falconnect.com>; C&CList <cnc-list@cnc-list.com> Sent: Fri, Aug 15, 2014 8:45 am Subject: Re: Stus-List blown alternator diode Also, you will notice that your batteries will discharge much faster than normal when used sail if it is the blocking diodes that have failed as the alternator will become a very large drain. Jack Fitzgerald C&C 39 TM Savannah, GA On Fri, Aug 15, 2014 at 8:36 AM, Burt Stratton via CnC-List <cnc-list@cnc-list.com> wrote: Simple answer:   Most do have internal diodes. To be sure you can google the part number of the alternator or look it up on the manufacturers web site.   You should see around 13.5 to 14 ish volts across your starting battery terminals when running. It will vary a little depending on the condition of the battery. If you have an ammeter you should see it move to the plus side of zero after starting. If you see 12 or less volts across your starting battery terminals when running or negative amps when running you have a problem with the alternator which could be the voltage regulator or diodes (assuming the belt is not slipping).   Skip   From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of wwadjo...@aol.com via CnC-List Sent: Friday, August 15, 2014 8:21 AM To: Brad Crawford via CnC-List Subject: Re: Stus-List blown alternator diode   The thread on alternators got me to ask myself, "how do you known if you have an internal diode on alternator, and how do you know if "blown?" I am, electrically challenged, admittedly. Bill Walker  CnC 36     Sent from my HTC   _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com

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