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Old 07-10-2023, 02:08 AM   #1
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Default Alarm at 3500 RPM

Hello. I have a 2005 3100 SCR. Recently purchased. I have a beeping alarm that goes on every time I hit approximately 3500 RPM. Is that something that is settable and the previous owner set it there? Can I turn it off?
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Old 07-10-2023, 10:28 AM   #2
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No it not something you can set, it’s indicating there is an issue. What engines do you have and are they carburetors or fuel injected?
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Old 07-10-2023, 10:32 PM   #3
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Hi, I have two Mercruiser 5.0 fuel injected engines. Any ideas on what the alarm could be?
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Old 07-10-2023, 10:54 PM   #4
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If you look at the Mercruiser manual under Documents it has a troubleshooting guide that provides faults based on the number of beeps and the pattern of them.
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Old 07-11-2023, 02:41 PM   #5
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Default Helm Warning

In the operation and Maintenance manual, I found the following. The warning will sound with a continuous for the following:
1. Low Oil pressure
2. Temp too high.
An intermittent horn will sound if:
1. Sterndrive oil level is low.

I believe I have a continuous alarm. Not too sure because I lower the throttle right away. When I looked at the oil pressure, I thought it was a bit high. Both were about 70 to 75 psi. Seams kind of high as the gauge only goes to 80. Shouldn't it usually run about half way? I recently had a mechanic change the oil, so I checked it. It looks like there is probably almost a quart too much oil in both engines. Do you think higher than normal pressure can cause an alarm. I am going to remove some oil from both engines.

Regarding the temperature. Both engine gauges showed about 3/4 on the dial. That seams on the higher side too but not sure.

Regarding sterndrive oil. I am not sure where that is to check it.
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Old 07-11-2023, 02:59 PM   #6
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Default Helm Alarm

Here is a pic of the page where I found the information.Click image for larger version

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Old 07-11-2023, 10:19 PM   #7
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Yes remove the excess oil but I think only low oil pressure will cause an alarm. Engine temperature should be 160*F but my gauge shows 175*F even though using an IR temp gun I get the correct reading. The gear lube reservoir is a plastic bottle on the front of the engine. Being that you have fuel injection there should be around 10 fault codes with different beeps. I donít think any are constant. A Rinda scan tool can read out faults from the ECM.
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Old 07-11-2023, 11:09 PM   #8
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Thanks. I will see if I can get that tool.
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Old 07-11-2023, 11:33 PM   #9
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Is there an OBD2 port on the boat dome place line that in my car? I have one of those for my car. When I look up the Rinda scan tool it gives me eve OBD2 scanner.
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Old 07-12-2023, 01:49 PM   #10
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Quote:
Originally Posted by Ddmccoy View Post
Is there an OBD2 port on the boat dome place line that in my car? I have one of those for my car. When I look up the Rinda scan tool it gives me eve OBD2 scanner.
An OBD2 tool wonít work but there is a similar connector for the Rinda tool.
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Old 07-13-2023, 06:34 AM   #11
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Ok. Where do I find the connection.
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Old 07-13-2023, 05:33 PM   #12
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Quote:
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Ok. Where do I find the connection.
H
Not certain but it will be near the ECM. I recommend you look at the Mercruiser manual.
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Old 07-13-2023, 06:46 PM   #13
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Thanks
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