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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 07-02-2009
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squeal from alternator

With the yanmar gm30 running and the batteries switched off it runs smooth and quiet. With the batteries switched on the alternator squeals .
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Old 07-02-2009
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The belt is slipping
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Old 07-02-2009
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You really shouldn't be switching off the batteries when the engine/alternator is running. Chances are very likely that the belt is glazed and needs to be replaced. It is probably slipping under the load that the alternator puts on it when it tries to charge the batteries.
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Quote:
Originally Posted by max10 View Post
With the yanmar gm30 running and the batteries switched off it runs smooth and quiet. With the batteries switched on the alternator squeals .
The quickest way I know to burn out the diodes!
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Old 07-07-2009
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Tighten the belt.
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Old 08-16-2009
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Never Ever

Never turn the battery switch off with the engine running. And I have to ask why would you ever do this, or want to. This is more than a little detrimental to the alternator, and I would be surprised if you have not blown some diodes already. The squealing is probably a slipping belt, because it is either loose or glazed.
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Old 08-16-2009
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my yanmar dealer said when that happens the batteries are down tooo far and the alternator has to work too hard to get them back up......ask yer yannie dealer--see what he says
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Old 08-18-2009
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Reminds of the time a bank teller told me, "I'm sorry sir you can not make a deposit to that account because it's overdrawn".

Quote:
Originally Posted by zeehag View Post
my yanmar dealer said when that happens the batteries are down tooo far and the alternator has to work too hard to get them back up......ask yer yannie dealer--see what he says
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Old 08-18-2009
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Yes, never disconnect the batteries or have them off when the engine is running. It will damage diodes while the alternator voltage surges.
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Old 08-18-2009
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Quote:
Originally Posted by timebandit View Post
Reminds of the time a bank teller told me, "I'm sorry sir you can not make a deposit to that account because it's overdrawn".
yes. i thought so as well--lol----he doesnt realize i am not as dumb as he looks lol.....
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