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#10789489 - 04/22/15 11:02 PM 2005 90 HP Merc. oil tank issue...maybe...
juggin4cats Offline
Angler

Registered: 02/02/09
Posts: 379
Loc: Midlothian/Mansfield, TX
I have a 2005 90 Hp. Merc. on my pontoon boat. I put the battery on it today for the first time in a few months and as soon as I turn the key on I got a loud buzzing in the console. It doesnt go off even after cranking. I have plenty of oil in the oil tank but thinking something is not working correctly inside hence the continuous loud buzzing...Im assuming this is the low oil alarm. Looking for anyones two cents worth on this one. Do I need to replace the whole oil tank if Im on the right path?
Thanks
Ken
_________________________


www.Classicgenerator.com

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#10789715 - 04/23/15 07:01 AM Re: 2005 90 HP Merc. oil tank issue...maybe... [Re: juggin4cats]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11203
Loc: Littlefield Tx & Lake A. H. US...
Look for the 2 wires going to the sensor and un-plug 1 at bullet plug while key on. If horn stops you know you have to replace the tank.
_________________________
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

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#10792084 - 04/23/15 08:28 PM Re: 2005 90 HP Merc. oil tank issue...maybe... [Re: juggin4cats]
Topwater2 Offline
Pro Angler

Registered: 03/06/14
Posts: 733
On my 2003 50hp the float in the oil tank was saturated with oil so it dropped down and set off the low oil alarm. I found this out when I took it the Merc dealer. They unplugged the wire at the tank and I didn't replace anything. It had a sight window and I just kept an eye on it. Didn't use much oil so it was no big deal. If it is the float you can replace it if you feel the need.
_________________________
FishKen

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#10792688 - 04/24/15 06:18 AM Re: 2005 90 HP Merc. oil tank issue...maybe... [Re: Topwater2]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11203
Loc: Littlefield Tx & Lake A. H. US...
Just rebuilt a 90hp Merc on a pontoon that someone decided to disconnect the oil alarm. Over a 75.00 dollar part: http://www.boats.net/parts/search/Merc/M...ENTS/parts.html
_________________________
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

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#10793009 - 04/24/15 08:50 AM Re: 2005 90 HP Merc. oil tank issue...maybe... [Re: gary purdy]
cove_crawler Offline
Angler

Registered: 02/16/09
Posts: 423
Loc: Lubbock, TX
I'm with Gary on this one. If I'm not pre-mixing the oil and gas, I want a working alarm.

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