90 hp Mercury Motor Heat Sensor

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paulNM

Recruit
Joined
Aug 15, 2009
Messages
1
I have a 90 HP Mercury Motor - I have replaced the impeller. Overheat alarm comes on continuously even without motor started. I have run the motor at idle - engine block and heads are not hot, but alarm continues. I am assuming the sensor or wiring is the cause??? Any comment or help would be appreciated.
 
Silvertip

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,762
Re: 90 hp Mercury Motor Heat Sensor

Disconnect the sensor. If the alarm quits, the sensor is the issue. If not, the module is probably toast or the tan wire from the sensor is shorted to ground (that's what the sensor does).
 
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pattymilink

Recruit
Joined
Aug 16, 2009
Messages
2
Re: 90 hp Mercury Motor Heat Sensor

Where is the heat sensor located on the engine block to disconnect it?
 
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