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Old 20-05-2022, 22:11   #1
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Yanmar 3YM20 - Trigger relay when engine is running

The Yanmar manual unfortunately only has a very basic wiring diagram with limited explanations.

I am looking to control a relay that opens/closes when my engine is running/stopped. It is a 2004 3YM20 and the control panel is the old Yanmar panel with a key.

A voltage sensitive relay will not work for my application, so I was hoping to connect my relay to one of the cables in the harness coming to the control panel but I am not sure which one to use.

Any tips would be much appreciated.
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Old 20-05-2022, 22:48   #2
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Re: Yanmar 3YM20 - Trigger relay when engine is running

Quote:
Originally Posted by Procyon_N340 View Post
The Yanmar manual unfortunately only has a very basic wiring diagram with limited explanations.

I am looking to control a relay that opens/closes when my engine is running/stopped. It is a 2004 3YM20 and the control panel is the old Yanmar panel with a key.

A voltage sensitive relay will not work for my application, so I was hoping to connect my relay to one of the cables in the harness coming to the control panel but I am not sure which one to use.

Any tips would be much appreciated.
It is best to use the oil pressure alarm wire. Note that this isnít the oil pressure sensor, which is for the meter.

Itís easier to find at the engine control panel, but most can point out the pressure switch at the engine as well.
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Old 21-05-2022, 00:33   #3
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Re: Yanmar 3YM20 - Trigger relay when engine is running

Greetings and welcome aboard the CF, Procyon.
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Old 21-05-2022, 01:42   #4
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Re: Yanmar 3YM20 - Trigger relay when engine is running

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Originally Posted by s/v Jedi View Post
It is best to use the oil pressure alarm wire. Note that this isnít the oil pressure sensor, which is for the meter.

Itís easier to find at the engine control panel, but most can point out the pressure switch at the engine as well.
Thanks Jedi. I will have a look tomorrow. Appreciate the quick reply.
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Old 21-05-2022, 01:43   #5
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Re: Yanmar 3YM20 - Trigger relay when engine is running

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Greetings and welcome aboard the CF, Procyon.
Thanks GordMay, I have been reading these forums for sometime. Seems like a great community of helpful people here.
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