Thanks to all for your help. I don't think the battery is the problem as it
is brand new and my battery monitor reads a steady 12.6 volts. I replaced it
this year because I found last year that if the voltage dropped below 10.5
volts the display turned off completely. The battery would quickly drain to
below what was required. 

I assumed that if the display comes on the power would not be the issue but
poor connections are a real possibility. I will check out those and the
current reaching the display as suggested.

The unit was never actually grounded in the past and that didn't seem to
cause any difficulties. What do others do to "ground" their electronics?
Would a bronze thru hull fitting not be sufficient? 

Graham Stewart
Agile, Rodes 22, 1976
Kingston Ontario

-----Original Message-----
From: Rhodes22-list [mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of
Lowe, Rob
Sent: Tuesday, July 7, 2020 9:37 AM
To: The Rhodes 22 Email List
Subject: Re: [Rhodes22-list] Network Quad problems

I'm with Michael.  Just because you have power to the unit doesn't mean you
have a good connection.  I'd examine every connection, especially those for
the transducer cables.  Having a bad ground can also effect the instrument
readings. - rob


________________________________
From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> on behalf of Mike
Riter <mike at traildesign.com>
Sent: Monday, July 6, 2020 9:29 PM
To: The Rhodes 22 Email List <rhodes22-list at rhodes22.org>
Subject: Re: [Rhodes22-list] Network Quad problems

Since the problem is affecting all four sensors, it seems suspiciously like
a loose or corroded connection. I would start at the instrument panel and
work my way back towards the transducer checking each connection point.

Michael Riter
SV Emma B



On Mon, Jul 6, 2020 at 7:49 PM Graham Stewart <gstewart8 at cogeco.ca> wrote:

> I have always been surprised at the answers that are posted here to some
of
> the most difficult questions so I am posting this question as a last
> desperate attempt to get help.
> I have been using my B&G Network Quad (speed knots, depth and water temp)
> instrument for probably more than 20 years and it has worked without fail.
> This year when I launched the boat it worked perfectly for the first day
> but
> thereafter the speed reads 0.00 continuously and the depth and temperature
> show erratic numbers.
> I checked the paddlewheel for obstructions and it was fine. Spinning the
> wheel manually makes no difference to the display. The fact that the
> display
> comes on tells me that power is not a problem. It seems unlikely that both
> the speed and the depth transducers would fail at the same time. The
wiring
> hasn't changed. The common element in the wiring is the connection to the
> "sea ground" which  I don't have but has never been a problem.
Nevertheless
> I connected the ground to a brass thru hull and that made no difference.
> I can't help feel that some tweak would fix the unit but I am now at the
> point where I am completely stuck with no idea what to try. So, if anyone
> on
> da list has a clue what I might do to diagnose the problem I would be most
> grateful.
>
> Graham Stewart
> Agile, Rodes 22, 1976
> Kingston Ontario
>
>
>