I have a 1989 Mercury 135HP V6, oil injected. I have read multiple post on the forum and gotten some very useful trouble shooting, now I have a problem that seems to be a combination of everyone's alarm problems so I was wandering if anyone has encountered this one, or have any advice. I first had the oil injection alarm, the intermittant beep. I first put the volt meter on the leads and rotated the engine manually to verify the correct voltage range. When i did that the high spot was in range but the low was 0 the manual say's it should be 1-6V. I did the continuity check on the tank level switch which was good. And the volatage to the alarm module itself was good. So I determined that the problem was the magnetic pickup, the oil flow sensor. I replaced it and I was still having intermittant oil alarms. The alarm is not in all the time and appears to only come in during throttle changes, and almost never in when I am up on plane at about 2/3 throttle or more. But never the less I decided to premix in a temporary tank and capacity check the pump. Capacity check was satisfactory. It is pumping the correct amount of oil at different metering barrell positions corrisponding to throttle positions. So now the alarm comes in here and there but not as often as before. But I do get the overheat (solid tone) when I first start the motor. It is my understanding that this the alarm module does a self check at startup and gives the solid tone but the alarm does not clear. I have a temperature gage and I know that it works because I have previously had an overheat condition when I first bought the boat a couple of months ago. I replaced the impeller and the thermostats and blew air through the pasages to verify clear. Well the solid tone alarm stays in for a prolonged period of time after engine starts and then clears. Throttle or speed of the boat does not affect it at all. I have removed the engine cowl after coming down to idle when the alarm comes in and the heads are not excessivly hot to touch. The pee hole discharge is pretty warm, but I don't know how warm that is really supposed to be but the temperature gage on the consule is reading about 130. Sometimes if I turn the ignition off and then back on again it clears. I don't typically get any alarms since this thing has been going solid on start and not clearing until I shut the engine down and restart it again. Does this prolonged alarm on start mean that the Alarm Module is bad? Is there anything else that could be going on? I know almost everyone's advice is get rid of the oil injection but now I don't seem to have that problem anymore or if I do I can't tell because my module is possibly messed up?<br /><br />Any info will be greatly appreciated? I am looking for a way to test the module to see if it is bad. Module are the most expensive part of the system. I can live without oil injection if I had to but I would rather not live without an overheat warning? I like to have a little redundancy in my indications so I can verify a problem.<br /><br />Thanks in advance for any help
