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Test for temp sender 2.5
0D188269 200 EFI 2.5
Constant alarm is sounding at all times. Disconnecting the port head temp sender at the connection block stops it. Is the switch simply going to ground when it closes? It is a 4 wire sender which intertwines with the oil injection warning module.
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Mercury 3L/4 Stroke/Verado Moderator
Tan w/blue stripe wire in the sender is the overheat warning. At approximately 194 degrees F, it completes a circuit to ground.
If it's shorted to ground a room temp... sensor is bad.