2000 Mercury 125 OB Alarm at Idle

jaxboater3

Recruit
Joined
Apr 28, 2008
Messages
5
I have searched the threads here. I have found many about overheating at high RPMs but nothing at idle. Here is my problem.

If I have a long no wake zone or even sit at the dock too long the overheat alarm starts up and wont stop until I get up to speed. This usually takes about 5 minutes at Idle then the alarm starts. Once I get up to about 3000 RPM and over it will stop in about 5 minutes. I did verify that it was the temp sending unit causing the alarm.

Is it a bad sending unit or what? Any help would be appreciated.
 
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