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Old 12-11-2011, 13:47   #16
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Re: Yanmar Tachometer Bouncing . . . Replacement ?

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Originally Posted by delmarrey View Post
One side is suppose to go to ground and the other to the tach. The tach has a power input and output to the sender. It is a reed switch that is magnetic and counts the teeth on the fly wheel, which sends the number of teeth to the tach computer and actuating the needle.


.

Thanks for this, greatly appreciated.

The interesting thing is that your and Gord's diagrams show one leg grounded whereas the official Yanmar service book doesn't.

Can I ask where this diagram came from and why it is more accurate than the Yanmar manual?
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Old 12-11-2011, 14:22   #17
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Re: Yanmar Tachometer Bouncing . . . Replacement ?

The tacho input was not earthed in the Yanmar loom but the DC supply earth to yours was prob. the fault & by supplying the DC side of things by earthing the black wire you got it working!! Most of the faults are on the engine side of the looms as the wires become brittle with heat age & oil. The Yanmar plugs & sockets are not the best for long life. (I live with two old 1GMs same loom)

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Old 12-11-2011, 14:32   #18
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Re: Yanmar Tachometer Bouncing . . . Replacement ?

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Originally Posted by akio.kanemoto
Can I ask where this diagram came from and why it is more accurate than the Yanmar manual?
It came from here >>>> Troubleshooting Teleflex Tachometer Gauges

Which is Teleflex gauges.

According to the 3GM30 drawing the body on your sender (item #8) is the ground and the two wires goto the tach "P" terminal (item #10).
A bit different I would say.

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Old 12-11-2011, 15:12   #19
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Re: Yanmar Tachometer Bouncing . . . Replacement ?

I had a problem that you are describing. I was turning the starting Batt off after starting and that was causing it.
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