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Old 16-03-2018, 15:57   #16
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Re: Yanmar Idiot lights

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Originally Posted by wsmurdoch View Post
You might try Googleing the shop manual for the Yanmar 2gm. Perhaps, http://www.jeanneau-owners.com/Manua...e%20Manual.pdf . Take a look at pages 12-2 and 12-3. There are two possible instrument panels. Look and see which one is yours. One has an instrument test switch; one does not. In any case, a wiring diagram is your friend. That and a VOM meter will find your problem.
A word of caution to the OP. The manual referenced above refers to later 2GM20 (and other xGMxx engines) built after ~ year 2000. The "instrument test" switch (DPDT) is actually both tach instrument light switch (in one position) and a cooling water lamp/buzzer test switch (in the other position). The switch is shown pictorially on page 12-1 as a centre off switch. I am presuming the tach light side is a normal action and the cooling water test is a momentary action.

Earlier xGMxx engines only had a SPST light switch which only operates the internal tach instrument light or (depending on instrument panel type), no light switch at all.

The OP has stated his engine is a xGM rather than a xGMxx and being an 1982 vintage, the above manual is not relevant. Yanmar has not changed its wiring very much over the decades but it does change occasionally .

From what the OP has posted, I'm sure his wiring is not stock standard Yanmar but he can be guided (not lead) by what has been posted so far.
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Old 16-03-2018, 16:05   #17
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Re: Yanmar Idiot lights

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Originally Posted by DotDun View Post
wiring diagram....
I am curious as to the revision and date of the publication this came from. I do note that is relevant to E serial numbers onwards for various numbers but I would like to know the date of the publication if you has such information.
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