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Long Point

2004 Chaparral ssi 230 350 Mag MPI

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My 2004 Mercruiser 350 Mag no longer sounds the warning horn when key is turned after boat has been shut down for a few days.  Sounds after running for a while and re=started.  Sounds when shut down for a few hours also.  Cannot located any poor connections.  Defective Horn or sensor?  Engine runs fine.

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30 minutes ago, Mi3sons said:

Is the fire boy arming?

??????????   OK, I'll ask. How does a Fire Boy arm?   W

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Don't know what a "Fire Boy" is.  Maybe my description was not very clear. Not a "Horn".  The piezo buzzer under the dash that monitors engine temp,  stern drive low oil,  and low oil pressure.  Usually sounds for a second when ignition key is turned.  Will sound on a re-start after engine is warm but not when the boat has been shut down for a day or more.   

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What I meant was is the auto fire extinguisher coming on? I have heard of a wire on the extinguisher bottle getting severly corroded and can make weird things happen. I haven't actually seen it but have heard several stories about it. Could also be a bad buzzer.

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Sticking oil  pressure sender? Do you show oil pressure on the gauge when you first turn the key and don't have an alarm?

brick

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15 hours ago, Long Point said:

Oil Pressure is something I will check.  Oil Pressure shows fine when running.  

Love that 230 SSi - great boat. One thing to keep in mind on your MerCruiser 350 Mag MPI is that the oil pressure sender for the analog oil pressure gauge is on a separate circuit than the oil pressure sensor which sends its information to the ECM which in turn sends the audio alarm signal to the piezo horn. Long way of saying I believe your oil pressure sensor is plugged with crudy old oil. If this is the case, than it would need Mercury part # 881897T11.  

NOTE: Not to be confused with the seawater pump pressure sensor which is located in the power steering cooler even though they look the same. (8M6000623)

I typically use my 1" deep socket to re & re. Sometime you can get a wrench on there should adequate space be there. Should be located on the rear of the engine attached to the block the by distributor.

Image result for 881879T11

 

Part # 36 is the oil pressure sensor in the link below - part # 38 is the oil pressure sender for the analog oil pressure gauge

2225.GIF

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Thanks very much for this info  Will have the boat home end of April getting it ready for summer.  Will check out the oil pressure sensor.  Looking forward to this summer

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