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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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Mercury 90 hp 2 cycle master alarm is going off constant beep

Customer Question

Mercury 90 hp 2 cycle master alarm is going off constant beep oil is full how do I trouble shoot
Submitted: 2 years ago.
Category: Boat
Expert:  Jeff G. replied 2 years ago.
Typically a solid beep is an overheat condition.Is the engine getting hot? Is it pumping good water? A solid stream from the indicator?Is this salt or fresh water?When was the last time the pump impeller was replaced?Check the tan wire from the cylinder head that it isn't shorted to ground, rubbing on the engine anywhere.When is the alarm going off?
Customer: replied 2 years ago.
Fresh water when key turns on it beep getting good water stream 100 hour check up nov 2014
Expert:  Jeff G. replied 2 years ago.
When you turn the key on the horn sounds and just keeps going?What is the serial number of the engine?
Customer: replied 2 years ago.
Serial number 1m9xmoo851co
Customer: replied 2 years ago.
What wire do I disconnect to turn of heat sensor
Expert:  Jeff G. replied 2 years ago.
Your serial number does not come up can you double check it? Will be on a tag on the swivel bracket near the transom.The temp sensor should be a tan wire on the cylinder head.
Customer: replied 2 years ago.
Ot212530 it's a 2001
Expert:  Jeff G. replied 2 years ago.
OK so disconnect the temp sender and see if the beeper stops.
Customer: replied 2 years ago.
How do I do that
Customer: replied 2 years ago.
Where is it what wire
Expert:  Jeff G. replied 2 years ago.
Look at the back of the cylinder head, near the top. It is a wire sticking out, the only one there.
Customer: replied 2 years ago.
What color
Expert:  Jeff G. replied 2 years ago.
Sir, please read my answers to you. I have told you twice it is tan.
Customer: replied 2 years ago.
I am looking at motor with cover of I see 2 spark plugs a tan wire with blue strips I disconnected alarm still going if please advise
Customer: replied 2 years ago.
3 spark plugs please send me pictures or diagram or something
Customer: replied 2 years ago.
Please cancel this request you cannot help me change me the $5 and cancel this thing thanks
Expert:  Charles replied 2 years ago.
Hello, my name is Charles.
Do you still need assistance with the alarm on the engine?
Customer: replied 2 years ago.
Sir please read my email what did it say
Expert:  Charles replied 2 years ago.
The one where it says that we Jeff cant help you.
I am not Jeff. I am another expert here on the site. I know your engine very well.