Mercury, 25ELPT-4s, 2001

by Rick Day
(Reedville, VA, USA)

The Guardian alarm sounds continuously after some use and reduces power. The outlet water is warm, but not hot and the head is not hot. I’ve disconnected separately the oil sensor wire and the water temperature wire and in each case, the alarm stops and I can get up to full speed. How do I get the alarm to stop sounding off or is t here additional diagnostics needed?

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