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Old 09-08-2013
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Re: bouncing tach

Jason--

A "bouncing tach" on a Perkins 4-108 is often caused by the alternator cycling on-off when one's batteries are fully charged. Try leaving your charger off for a day or so with a small load applied to to your batteries--lights, a refrigerator or whatever-- and then see if you still experience the same issue. We found this to be the case on our boat and now overcome it by simply applying some loads to the batteries when it happens.

FWIW...
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