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post #1 of Old 06-17-2010 Thread Starter
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Warning horn chirping

Here is a new one: my boat is powered by Yanmar 3GM30F. Motored hard (3400 rpm) for three hours, when pulling up to mooring the warning/starting horn started to chirp ever so slightly until motor was shut down and switch to off. That was 4 weeks ago; it has been getting worse since, now sounding at higher RPMs. I have checked temp; normal. Thermostat opening after warm up, plenty of water out with exhaust. Any ideas?
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