Join Date: Mar 2010
Location: SF - South Bay
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Re: Knot Meter
FWIW, with me if the paddlewheel is gunked up, it normally registers 0. Even while underway, the wheel does not turn, so the speed is zero. Likewise, if a wheel is broken, you get zero or erratic numbers.
A pure guess - 888 flashin often means the instrument is not connecting to the sensor...
I would do the basics:
1) Look for an owners manual (Google is your friend)
2) Trace the wiring and visually inspect to ensure it is sound and corrosion free
3) pull the paddlewheel (sensor), clean and replace - making sure you are ready to plug the hole when you remove it! Incidentally, you should be able to spin the wheel manually and see numbers on the instrument...
If none of the above work, more detailed testing will be needed.