Not sure if the 3gms are the same as the 2gms, but there is a fuse that sits near the back of the engine. The housing of mine had cracked and caused intermittent connections. I replaced it with a wireing to a circuit breaker on my 12 volt panel and the appropriate sized breaker. Just another place to look.

--
Cheers,
   Jeff Nelson
   Muir Caileag
   C&C 30
   Halifax

On 17/09/2014 9:53 AM, Tony Wroblewski via CnC-List wrote:
I have had the same problem on my Yanmar 3gm30 for years. Exactly as you describe. Since it would start on the second try all the time it was no problem. One time it wouldn't start at all for 10 minutes and caused me to find the source. Tightened the battery cables and no problems for a year. Starting to happen again and will try the cables again.

Tony
Triumph C&C 41
Holland, Mi

> Date: Wed, 17 Sep 2014 08:07:55 -0400
> To: nausetbe...@optonline.net; cnc-list@cnc-list.com
> Subject: Re: Stus-List Yanmar push button died
> From: cnc-list@cnc-list.com
>
> I may have a related problem - and would like help to diagnose the cause before it becomes a significant issue.
>
> From time to time - not sure if it is getting more frequent - with the key turned, battery on and fully charged - I get nothing - not even a clunk - when I press the button. I press it a second time and 99% of the time the engine fires right up.
>
> Have any listers experienced the same - and help me identify the problem so I can fix it before I get to the stage where I can't start the engine at all.
>
> --
> Jonathan
> Indigo C&C 35III
> SOUTHPORT CT
>
> > On Sep 17, 2014, at 7:29, Nauset Beach via CnC-List <cnc-list@cnc-list.com> wrote:
> >
> > Nate
> >
> > Had the same issue last week on my Yanmar 3GM30F with a B Type engine panel. > > Was getting near complete voltage drop across the 2 terminals of the key > > switch when the key was turned on and nothing from the button. Turned out > > to be the wiring harness plug at the back of the panel. Most of the wires > > were corroded inside the plug though all looked well from the outside. The > > plug was cut out and the wires connected directly. Works like a charm.
> >
> > So as Dave said, check all your wiring in the start circuit before you start
> > throwing $$$ at it replacing parts.
> >
> > Brian
> >
> > -----Original Message-----
> > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dave
> > Godwin via CnC-List
> > Sent: Tuesday, September 16, 2014 8:16 PM
> > To: Nate Flesness; cnc-list@cnc-list.com
> > Subject: Re: Stus-List Yanmar push button died
> >
> > Nate, it may not be the switch. I have an original in perfect working
> > condition if catch my drift...
> >
> > Check your battery ground/cabling/connections. Let me know if it is the
> > switch and if so, you can have it.
> >
> > Dave
> > 1982 C&C 37 -Ronin
> >
> > Sent from my iPad
> >
> >>> On Sep 16, 2014, at 19:55, Nate Flesness via CnC-List
> >> <cnc-list@cnc-list.com> wrote:
> >>
> >> I have a 2QM15 yanmar - after a few intermittents, my engine start button > > has failed completely. Someone knew what Cole-Hersee switch can replace it -
> > anyone remember, or have another suggestion?
> >>
> >> Nate
> >> Sarah Jean
> >> 1980 30-1
> >> Siskiwit Bay Marina
> >> Lake Superior
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--
Boat_Sig Cheers,
    Jeff Nelson
    Muir Caileag
    C&C 30
    Armdale Y.C.
    Halifax
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