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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: 1 year ago.
Category: Boat
Expert:  Jeff G. replied 1 year 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 1 year ago.
Fresh water when key turns on it beep getting good water stream 100 hour check up nov 2014
Expert:  Jeff G. replied 1 year ago.
When you turn the key on the horn sounds and just keeps going?What is the serial number of the engine?
Customer: replied 1 year ago.
Serial number 1m9xmoo851co
Customer: replied 1 year ago.
What wire do I disconnect to turn of heat sensor
Expert:  Jeff G. replied 1 year 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 1 year ago.
Ot212530 it's a 2001
Expert:  Jeff G. replied 1 year ago.
OK so disconnect the temp sender and see if the beeper stops.
Customer: replied 1 year ago.
How do I do that
Customer: replied 1 year ago.
Where is it what wire
Expert:  Jeff G. replied 1 year ago.
Look at the back of the cylinder head, near the top. It is a wire sticking out, the only one there.
Customer: replied 1 year ago.
What color
Expert:  Jeff G. replied 1 year ago.
Sir, please read my answers to you. I have told you twice it is tan.
Customer: replied 1 year 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 1 year ago.
3 spark plugs please send me pictures or diagram or something
Customer: replied 1 year ago.
Please cancel this request you cannot help me change me the $5 and cancel this thing thanks
Expert:  Charles replied 1 year ago.
Hello, my name is Charles.
Do you still need assistance with the alarm on the engine?
Customer: replied 1 year ago.
Sir please read my email what did it say
Expert:  Charles replied 1 year 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.

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