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97 150 ocean pro alarm

B

billf

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"when i turn the key on an ala

"when i turn the key on an alarm sounds motor running or not .it cycles through the alarm lights in the tack ,all go off but i still have an audible alarm. the strange part is if i push the key to choke the motor a few times it will reduce in sound about 90% but never goes away .is my key switch going bad a sencer or ? it as done this for over a year with no ill effect. i have twin motors and have switched the temp sensors and check the conections on the key switch what next"
 
"Bill,
I am not totally famil

"Bill,
I am not totally familiar with your engine but it sounds like a bad ground somewhere in your alarm system. I am assuming that the alarm is for high temp only? If so then start at the motors and work forward to the remote control and check every connection in that circuit. Disconnect each temp sensor one by one to see if the alarm stops. If it does then that temp sensor is bad. If not, work your way towards the remote and check for a ground fault in any of the wiring. If nothing in the wires then tear the remote apart and check the alarm horn for a short. Some alarm horns have a piece of insulation behind them to prevent contact with the remote body. This could have come off thus allowing the horn to contact the remote body (ground) and setting off the alarm. Next check for a ground fault in the ignition switch. The same basic procedure would work for other types of sensor alarms like oil, etc."
 
"thanks greg ,i did switch the

"thanks greg ,i did switch the temp sensors from one motor to the other with no effect .any idea why pushing in on the key makes it almost go away .my alarm horns(one for each motor ) are to plastic pizo horns mounted under the dash and easy to get to .would a bad ground make the alarm lights in the tack work (go out)but the alarm horn still sound ."
 
"Well there could be a couple

"Well there could be a couple of things going on here. One, the horns could be getting their ground from the igintion switch or some component tied into that. Whereas the tach cluster could be getting it signals through another wiring circuit. So the tach could be seeing a normal signal whereas your horn maybe getting a ground through a different set of wires. Now if the ground is a weak one then the volume of the horn will change with the strength of the ground. Pushing in the key choke maybe affecting the grounding strength somehow causing the horn to quiet slightly. Again I don't know exactly here because I don't own this model engine. Do you have the service manuals? If so they should have the wiring diagrams in there. That should help determine how the alarm is wired through to the horns and the tach. I would think that everything should still go back through the remote somehow and then out to the guage and the horns."
 
"Bill, I know that you switche

"Bill, I know that you switched the temp sensors but I would unplug each anyway to see if that silences the horn. Just because you switched sensors from one motor to the other doesn't necessarily mean that one could not still be bad. Those temp sensors are a bi-metal coil that expand when they get hot. When they expand they create a ground against the engine head which sets off the horn. Problem is sometimes the coil will open up on it's own causing a premature ground setting off the horn also. I would go down the line and unplug each one until the horn stops singing. That sensor will be your fault. If all are are unplugged and the horn still sounds then you definitely have a grounding issue in that circuit."
 
The horn has a test circuit bu

The horn has a test circuit built into it. It should sound the alarm for a short time whenever the key is turned on. This tells you that the horn is functional. The test circuit in your horn is malfunctioning. Replace the horn.
 
thanks guys .i due have shop m

thanks guys .i due have shop manuls i will try replacing the horn and upluging sensors .the fun part is when the motor is running i cant hear it (old ears)but it drives my son nuts
 
"well the plot thickins ,i put

"well the plot thickins ,i put in a new horn still have the alarm ,unpluged heat sensors still have the same low audable alarm"
 
"The horn should have had thre

"The horn should have had three wires connected to it. One has power from the accessory circuit. One of the other wires grounds the test circuit in the horn. The other is grounded by your sensors to sound the alarm. Test this wire for grounding. If all sensors are disconnected and you get a ground here, something is shorting to ground. It could be in the remote box if that is where the horn is. Sometimes the simplest thing to do if this wire is grounding, is to just replace the wire completely. If the short is in the harness or the plug it can be very difficult to repair.

It could have something to do with the warning circuit on the VRO pump, but this is usually not a continuous tone."
 
"my horn is located under the

"my horn is located under the dash and has a 2 wire factory snap connector the wires runs into the main wire loom and are never see again . on the motor end under the the motor cover i have a single wire heat sensor, this single wire runs into another heat sensor and out of it to the main loom .i asume the 2 wires to the horn are one + and the other - the negitive would ground if the sensor gets hot ?. so i would need to replace the ground from the horn to the temp probe ?
may tack has hot,low oil,ck engine and fuel alarms how due i check these or due i need to ?"
 
"That horn does run through th

"That horn does run through the system check gauge. It should have a purple, and a tan/blue stripe wire. A continuous tone is supposed to indicate overheating. This would be triggered by the tan wire that enters the system check gauge. See if that wire is grounding.

There should be a tan wire with a different color stripe for each of the other sensors entering the system check gauge. Check them all for grounding.

If none are grounded, the gauge may have an internal short. With the gauge unplugged, the tan/blue stripe wire on the gauge would show continuity with the black wire on the gauge."
 
"update,my system check tach w

"update,my system check tach was bad ,replaced it and problem solved .must have been a short in tach it self"
 
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