SailNet Community - View Single Post - beta marine BD722 tach acting very very strange!
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post #2 of Old 07-28-2011
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Did you only change the battery or was something else done at the same time? I suspect that something has been disturbed when the work was done as this is a classic symptom of a loose connection of a bad wire. The tach gets its signal from the alternator so if something has been added to the charging system it could be affecting alternator output and therefore the signal to the tach.

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