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#11012453 - 07/31/15 04:40 PM 1999 Mercury 75hp high pitch noise
nitro1997 Offline
Outdoorsman

Registered: 04/14/15
Posts: 241
Headed back to the ramp and about 50 yards into it, a very loud high pitched noise started. Sounds like it is coming from under the dash. Boat had been running fine all day, peeing fine, plenty of oil. Thinking that it is an engine alarm. As soon as you turn the key the noise starts. Where should I start?

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#11012595 - 07/31/15 05:36 PM Re: 1999 Mercury 75hp high pitch noise [Re: nitro1997]
kingdad101 Offline
TFF Guru

Registered: 10/24/05
Posts: 20735
Loc: W.F. Texas
oil tank sensor is a good try....

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#11012613 - 07/31/15 05:45 PM Re: 1999 Mercury 75hp high pitch noise [Re: nitro1997]
nitro1997 Offline
Outdoorsman

Registered: 04/14/15
Posts: 241
If it is an engine alarm, would the noise still start as soon as the key is turned without cranking the engine.

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#11012625 - 07/31/15 05:51 PM Re: 1999 Mercury 75hp high pitch noise [Re: nitro1997]
Topwater2 Offline
Pro Angler

Registered: 03/06/14
Posts: 733
The oil tank float can get saturated and sink. I had one do it to me. Instead of pulling the tank, I pulled the wire and kept the tank full. Turn the key on, disconnect the wire from the tank and see if the alarm stops.


Edited by FishKen (07/31/15 05:52 PM)
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FishKen

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