[C320-list] Instruments gone awry

[Dave Chase]

Since there are a number of problems, I'd look at power/ground 
connection issues and check for corrosion. Have any electrical 
connections been changed such that a ground may have been moved?

Dave Chase
Indigo
1994 C320 #97


On 6/13/19 12:21 PM, William Russell wrote:
> On my 1998 C320 (#545) I have ST40 Plus instruments (speed, wind, depth,
> autopilot).  They've always worked fine in previous years.  This year, I'm
> getting very unreliable (or non-existent) performance from them.  Speed
> seems to work, but I've not checked it against a GPS to see how accurate it
> is.  Wind direction doesn't work at all, until partly through a race it
> starts to read, though not consistently or accurately compared to the
> Windex.  Wind speed reads, but again, I can't tell how accurately, and it
> often seems way off. Depth is completely inaccurate - sitting at the dock
> in 6-7 feet of water, it showed 14-16 feet, and changed minute by minute
> even though we weren't moving.  The compass on the autopilot reads 20-30
> degrees differently than the binnacle compass, and the "wind" setting on
> the autopilot won't work without an accurate apparent wind direction.
> I can't figure why I would get such variable and unreliable performance
> from all of the instruments at once.  They were installed by the (very
> knowledgeable) previous owner, so I don't really know where to start to
> troubleshoot.
> Any suggestions?
> Bill Russell
> "Little Wing," 1998 C320, #545
> Cayuga Lake
> Ithaca, NY
>
>