Interesting discussion. So, I have run my 1985 2gm Yanmar briefly with the key removed and no apparent harm was done. The manual does say never to run it with the battery disconnected.
Now, when I check the schematic, (and my engine) there is a 30A tubular fuse in series with the key switch. Therefore a blown fuse = an open key switch, and would cause the same damage to the alternator. This does not make a lot of sense to me. Other than adequate knowledge, am I missing something? See below. http://www.cruisersforum.com/forums/members/31207-albums977-picture16384.png Dave Syer - '85 33-2 Message: 1 Date: Sun, 17 Jul 2016 22:47:17 -0400 From: "Jean-Francois J Rivard" <jfriv...@us.ibm.com> To: cnc-list@cnc-list.com Cc: amira...@bellaliant.net Subject: Stus-List Relocating the Yanmar key now alternator.. Message-ID: < of7c4f9827.241c1f14-on00257ff4.000d9ee3-85257ff4.000f5...@notes.na.collabserv.com > Content-Type: text/plain; charset="us-ascii" Agreed, I experienced it 1st hand a few months after I had bought the boat a few years back.. I had a brain fart and turned the key to "off" while the engine was running. The diodes instantly fried, the alternator was toast / the charging warning was light on.
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