alarm going off 1995 50hp merc

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kmac

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May 21, 2003
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my alarm is going off on my 1995 50 hp merc. It isa oil injected. The alarm does not sound all the time but is somewhat intermittent. lately it has sounded more than it hasn't. how do i tell if it is a cooling problem or oil problem. The engine pees and the water feels luke warm and the thermostat is removved. If it is oil, how do i check to see if it is pumping?
 
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KCLOST

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Re: alarm going off 1995 50hp merc

An oil warning will be a "beep,beep,beep"<br />An overheat warning will be a constant "beeeeeeeeeeeeeeeeep".
 
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kmac

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Re: alarm going off 1995 50hp merc

Well that just ruled out half of it. Any advice on how to check if it is overheating or could I have a bad sensor?
 
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rickromin

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Re: alarm going off 1995 50hp merc

Originally posted by kmac:<br /> Well that just ruled out half of it. Any advice on how to check if it is overheating or could I have a bad sensor?
Click to expand...
 
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rickromin

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Re: alarm going off 1995 50hp merc

Originally posted by kmac:<br /> Well that just ruled out half of it. Any advice on how to check if it is overheating or could I have a bad sensor?
Click to expand...
I had the same problem with my 1994 50 hp. It turned out to be a bad sensor.
 
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kmac

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Re: alarm going off 1995 50hp merc

Where is te sensor located and how can i test it?
 
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kmac

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Re: alarm going off 1995 50hp merc

I'll have to get back to you later today when I get home and get tthe #
 
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KCLOST

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Re: alarm going off 1995 50hp merc

I've looked at a schematic of a 95 50hp... It doesn't show an overheat sensor but does show a temperature sender.... Your motor most likely has one or the other... In any case, it is located near the top spark plug... with one wire going to it... Held in place with a retainer plate and two bolts...
 
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KCLOST

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Re: alarm going off 1995 50hp merc

Also, when are you getting the alarm,,,,<br /><br />Is it mostly at WOT (high rpms), or idle, or all the time....<br />You could actually have an overheat problem... Have you replaced or checked the impeller recently?
 
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kmac

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Re: alarm going off 1995 50hp merc

It is all the time. No I have not replaced my impeller lately
 
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KCLOST

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Re: alarm going off 1995 50hp merc

If it's all the time, especially right after start-up when the engine is diffinitely still cool, You most likely have a falty temperature switch.... Check the lead going from the sensor to the terminal block... Look for the insulation on the wire worn. If that lead is worn and grounds itself to the block, it will trip the alarm... <br /><br />First disconnect the lead from the terminal block and see if the alarm goes away.. If it does, you will know that the temperature switch is at fault...
 
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kmac

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Messages
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Re: alarm going off 1995 50hp merc

I'm still on the warning buzzer. I just picked up the clymer manual for the engine. It shows a warning module. # 15. It seems as though when I move the wire going to the module The buzzer will stop. I guess I need to get in behind there and see if there is a loose conection or frayed wire going to the module. It doesn't look like it will be an easy thing to get to but I wanted to be sure I got the manual before I started
 
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kmac

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May 21, 2003
Messages
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Re: alarm going off 1995 50hp merc

I cannot find what warning module does or what I will find when I pull it out
 
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