[C320-list] Intermittent Tachometer Operation

[Doug Treff]

Here's the correct procedure according to a tech article on that association's website:
https://c320.org/article.php/20110403205247623?query=tachometer

--
Doug Treff
doug at treff.us

On Mon, Oct 2, 2023, at 9:09 PM, surprise thompson87.com via C320-list wrote:
> 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
>>>>