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Re: Help figuring out this engine buzzer circuit
My guess is that this is the answer:
You said the buzzer is grounded through a wire connected to the engine block. If you look closer at the connection point on the engine block, you should find it to be an oil-pressure switch connecting the ground side of the buzzer only when there is little or no oil pressure. When there is sufficient oil pressure, the connection at the oil-pressure switch will be disconnected from ground and the buzzer will stop.
That sounds very promising. Thanks, I'll check that out when I'm next out there.