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Old 26-09-2014, 15:02   #1
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Alarm will not stop

I have a 5.7 Merc Cruiser I/O, bravo 3. The alarm sounder will not stop! Temp gauge working, oil pressure gauge working and gear lube resivour full. A solid tone and sometimes an interment beeping. Any suggestions welcomed. Thanks.
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Old 26-09-2014, 15:21   #2
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Re: Alarm will not stop

Alarms are usually triggered by switches. Senders are used to control the gauges. You might have a shorted temperature or pressure switch. That are independent of the gauges.
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Old 26-09-2014, 15:46   #3
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Re: Alarm will not stop

Thanks, thinking I will just replace all sensors and switches. The boat is thirteen years old and all original switches.
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Old 26-09-2014, 15:59   #4
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Re: Alarm will not stop

You do not need to replace the switch sensors, they are pretty much always off and so when they go off they are shorted closed so just pull the wires until the horn turns off and you've found your bad switch.
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Old 27-09-2014, 11:55   #5
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Re: Alarm will not stop

One more question on constant alarm. Is the oil pressure switch and the oil pressure sensor on the same component or are they two separate devices located in different areas of the engine block? 2001 5.7 Merc Cruiser, carbarator
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Old 07-10-2014, 21:18   #6
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Re: Alarm will not stop

Oh man sorry, I just noticed your question so apologies for not replying earlier!

Anyway, I do not know for certain but the older mercruiser 5.7's (properly called a 350 back in the old days) have 2 sending units. The oil pressure sending unit is down by the oil filter and the warning horn switch is located up by the distributor on the top of the engine. BTW sometimes this switch is also used to control an electric fuel pump.
Anyway, that switch should have continuity to ground with the engine off but have no continuity with the engine running and having oil pressure.

Hope that helps!

Mark
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Old 08-10-2014, 05:06   #7
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Re: Alarm will not stop

Yep! Replaced all sensors, switches and sensors but still had alarm. Received your note, went out to the boat, located sender in front of dist. That was the problem! Everybody has been telling me there are only three devices that activate alarm horn. Was getting ready to start on wiring harness. Not now, all fixed. Again, thanks! I live in Daytona, Fl and most mech. Want $60 to $80 an hour.
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Old 08-10-2014, 06:19   #8
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Re: Alarm will not stop

Greetings and welcome aboard the CF, Yes Deer.
Glad to hear you got your problem sorted out (thanx to Mark)
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Old 08-10-2014, 06:40   #9
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Re: Alarm will not stop

Most importantly, you now have an understanding of the system and can now follow logical trouble shooting steps when a mechanic isn't around.
BTW, mechanics gotta eat too, $60 an hour is actually a pretty good rate
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