1. Shutting off the key should NOT have this effect. Something is wrong. The alternator output should not be switched through the ignition whatsoever!
2. Zap-Stops are 15 volt zener diodes that cost about $2.00 or so. Depending on what happens, they can eventually catch on fire or melt, thus they are no longer sold. I melted one and the replacement has been good for about 15 years now. Joe Coquina C&C 35 MK I From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Gary Russell via CnC-List Sent: Tuesday, June 21, 2016 07:37 To: C&C List Cc: Gary Russell Subject: Stus-List Alternator Failure Well, It's happened again. The "ignition" key on my diesel got shut off while the engine was running (before stopping the engine with the stop lever) and it fried the diodes in the alternator. Question #1. Can anyone explain the failure mechanism to me? Question #2. On my last boat I was able to buy a protection device (I think it was called a "Zap-Stop") that protected the alternator in the event someone shut off the key with the engine running. The dealer I bought it from is now out of business and I can't seem to find it anywhere. Does anyone know how I can protect the alternator from this happening again? Thanks, Gary S/V Kaylarah '90 C&C 37+ East Greenwich, RI, USA ~~~~~~~_/)~~~~~~
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