Another Alarm Module Question

[enginereid]

Hi! I have read 7 pages of alarm module q&a, but still am confused. I recently purchased a whaler with a 2003 Merc 125 Saltwater outboard. The model is 2003 125EXLPTO, serial # OT 734093. My Merc manual leads me to believe that I should have a alarm module. I don't. I don't get any self-test at startup, and the key operated fuel enrichner (choke) doesn't work. I grounded out the hi temp sensor, and the alarm horn sounded a steady beep, and the choke started working. I didn't ground the oil level sw, but emptied the tank, never getting an alarm. The wiring from the hi temp and the oil level are connected to each other, and then lead back to the horn and ignition. The manual shows that these connect seperately to a alarm module (makes since if you want different sounds). I don't have one! Is this right, or did a previous owner remove it? How does the choke fit into this puzzle? Some earlier posts about this subject suggested that Merc 2 strokes no longer have this module (ODDD1). Any help would be appreciated.

 

[KCLOST]

Re: Another Alarm Module Question

I sounds like the wires are both connected to the terminal block.<br />You have a pretty new engine, so I'm not sure about the Overheat switch needing to go to the alarm module, but it does go normally to a terminal block and when it is grounded out the warning horn will sound. <br /><br />The alarm module is basically only taking leads from the oil pump and oil cap. Then another lead goes from the module to the terminal block.<br />(it's set up this way on older mercs anyway). The alarm module sends the intermittent, but the overheat switch is always a constant ground to the block.<br /><br />I don't think the oil cap sensor will ground out to the block (unless one wire is connected to the engine block somewhere and the other is connected to the terminal block), that is probably why you are not getting any alarm at all when you emptied the tank. Or it could be faulty. It's designed to obviously go to the alarm module only to then send the intermittent signal, as well as the oil pump rotation leads.<br /><br />Someone please correct me if I'm wrong here...