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Case 580k Tack wrong reading

greg My Tack has not shown correct RPM's for sometime. I would like to try and fix this. I know the signal comes from the alternator. Can that be fixed without replacing the alternator?

Reading was off only by a little a year ago, but now tack pins at idle.

greg Ok AJ responded before, i will check for 6 volts ac out of the W wire and report back


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