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Yanmar 3ym30 won't stop

Woody v12

New member
Me again ( the amateur repairer) ...Other motor (catamaran) Recently submerged. Replaced starter and alternator and stater relay. Motor starts and runs ok but is unresponsive to stop button. Stops when engine solenoid button pressed. Checked stop solenoid and its OK. Any suggestions on where to go next?

thanks in anticipation
 
Thanks aliboy
Found problem this pm. One of the wires in the plug that connects to the relay was badly corroded. Wasn't obvious until relay unscrewed then a nice big apart as wire broke away.
 
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