[C320-list] Intermittent Tachometer Operation

[surprise thompson87.com]

He says that is true for tachometers that sense from the alternator. The Yanmars do not use the alternator but rather have a separate sensor that detects flywheel rotation directly. Should not be affected by charging state. 

> On Oct 2, 2023, at 10:21 AM, Greg Flanagan via C320-list <c320-list at lists.catalina320.com> wrote:
> 
> If you check
> Boatowners Mechanical and Electrical Manual by Nigel Calder
> He says the tach issue is due to high charging rate, yes when you have the alternator and solar it happens. I have the same issue. There isn’t much you can do about it other than increase your house demands (turn on the radar?).
> 
> Greg
> Hoop Dancer #1076
> Sidney, BC
> 
>> On Oct 1, 2023, at 10:38 PM, Albert Kitten via C320-list <c320-list at lists.catalina320.com> wrote:
>> 
>> Have you got solar panels? If batteries are full on,a sunny day? I'll
>> explain if necessary.
>> :)
>> 
>>> On Mon, 2 Oct 2023, 4:47 am Ian Neale via C320-list, <
>>> c320-list at lists.catalina320.com> wrote:
>>> 
>>> Hi,
>>> 
>>> I have an 07 320 with a Yanmar 3YM30 engine.
>>> 
>>> The tachometer is intermittent in operation where at times the needle goes
>>> back to zero while the engine is running.
>>> 
>>> I think the tachometer runs off the alternator, but not sure. Wiggling
>>> wires on the back of the alternator doesn’t seem to fix the problem.
>>> 
>>> I have also cleaned all connections in the back of the tachometer.
>>> 
>>> Any suggestions as to what could be the problem.
>>> 
>>> Thanks, Ian Neale.
>>> 
>>> Solutions.
>>> 
>>> Sent from. my iPhone
>>>