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ContinuousWave: Small Boat Electrical
Mercury Alarm Sounding
|Author||Topic: Mercury Alarm Sounding|
posted 04-09-2007 01:12 AM ET (US)
How does [the author] reset [the alarm which is sounding on his] 1998 Mercury 75-HP motor? [The author's] water has was crimped when [the author] was running it for a few minutes. [The author] heard the alarm, fixed the problem and now [the author] can't shut the alarm off. Not sure what to do.
posted 04-10-2007 09:54 AM ET (US)
You might get some responses to your question if you tell us what the following means:
Does this mean that you were running your engine with cooling water supplied by a hose and the hose had a kink in it for a few minutes? Approximately how long did the engine run dry?
posted 04-13-2007 06:22 PM ET (US)
[S]orry, the [hose which feeds the water exhaust to the engine's confidence stream outlet or aspirator] was crimped when [the author] closed the engine cover. [The 1998 75-HP Mercury] only ran fo a few minutes. But the buzzer is now just staying on, even when [the engine] is cold when you first start it. [The author] has not used it since. Don't wanna stuff it if there is a problem. [C]an the sensor be reset? Or is it stuck on? [The author] knows Mercury motors have problems with the alarm. But [the author is] not an idiot. [The author is not] just gunna cut the wire.
Thanks for any help.
posted 04-14-2007 10:36 AM ET (US)
I doubt that the tell-tale hose being kinked would cause any alarms. It's sole function is to provide a visible indicator that water is flowing through the engine. If that was the only restriction of water flow, you have something else going wrong here.
By the way, "crimped" is how tubing and hose are connected to each other, not something that happens when one bends a hose beyond it's minimum bend radius, that condition is known as a "kink".
Is this a two-stroke or four-stroke engine we're talking about here? How was the cooling water connected to the engine? Muffs? Or an adapter? Why was the engine cover off during this run? Give us a little more to go on, and you'll get better info back.
posted 04-15-2007 10:11 AM ET (US)
I am not familiar with your specific motor or its alarm circuit. Generally a continuously sounding alarm comes from a temperature sensor.
There are several possible modes of failure in this situation:
--there is an alarm condition, the alarm is sounding properly, and you have failed to detect the alarm condition;
--there is no alarm condition, the alarm is false, and you have a electrical failure in the alarm circuitry.
If the first case, you have to look for some actual malfunction in the engine. If the second case, the electrical failure in the alarm circuitry can be located in
--a failed sensor which is falsely signaling an alarm to the alarm module
--a failed alarm module which is falsely signaling the alarm sounder
--a failed alarm sounder which is falsely signaling an alarm without actual alarm input
To test for the first case, locate the temperature sensor and disconnect it from the alarm system. If this quiets the alarm, then the sensor is bad. If this does not quiet the alarm, look for other alarm sensors and disconnect them individually, check to see if they quiet the alarm. If you find that disconnecting a sensor will quiet the alarm, then it is likely that the problem is localized to that sensor.
If the alarm persists even with sensors disconnected, the alarm may be coming from the alarm module itself. Locate the alarm sounder. Disconnect the alarm module input lead from the sensor. If this quiets the alarm, then the alarm sounder is working properly and the alarm is being generated in the alarm module. Service or replace the alarm module. If the alarm persists with the alarm module disconnected from the alarm sounder, then the alarm sounder has malfunctioned. Service or replace the alarm sounder.
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