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Old 06-18-2016, 10:40 AM   #21
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Good sleuthing

If that connection is badly rusted, there may be others. Our Yanmar wouldn't start one day and it turned out to be corrosion on the ignition wire connection on the starter (found it 5 minutes with the help of the trouble shooting section in Nigel Calder's book) so it seemed to make sense to check & spray all electrical connections.

Hope it's that simple!
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Old 06-18-2016, 11:34 AM   #22
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Once you get it clean a little dielectric grease will reduce future corrosion.
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Old 06-18-2016, 01:55 PM   #23
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You can pull the connector out and examine its condition, usually a little prong must be depressed on the wire side. The connector could be loose and corroded on the inside. High resistance makes these overheat, then the metals loose spring tension.
Cleaning the outside wont do much.

Usually these are tin coated, I have cleaned some of these with white vinegar, which can strip the tin. Then you can grease it or spray it with some oil.
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