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Old 06-24-2014, 06:30 AM   #16
CaptTom
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City: Southern Maine
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 2,717
Quote:
Originally Posted by Northern Spy View Post
...your signal strength is dependent upon the voltage output. If you are in float stage on your charger, the alternator output voltage is low, and the tach signal output is a fraction of that. Likely cause of why you are losing your signal.
I can confirm that. Underway after two nights on the hook the other day, my wife said "hey, look - both tachs are reading correctly now!"

This is the first time the port tach has consistently worked right. It's also the most load we've ever put on that alternator. I expect it'll be back to showing twice or three times the actual RPMs next time we leave the dock with a fully-charged house bank.
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