Merc. alarm horn frustration.

[captpete13]

the alarm module is bad

[THEFERMANATOR]

Need to isolate it out. I would unplug the oil injection warning module and see if it stops going off. If that doesn't do it, unhook the overheat sensor(s). Just have to work your way down the chain until you find the problem. On an older engine, it could also easily be corrosion making continuity occur where it shouldn't.

[Destroyer]

Originally Posted by THEFERMANATOR

Need to isolate it out. I would unplug the oil injection warning module and see if it stops going off. If that doesn't do it, unhook the overheat sensor(s). Just have to work your way down the chain until you find the problem. On an older engine, it could also easily be corrosion making continuity occur where it shouldn't.

Ok, will start doing it by the numbers...

THANKS TO EVERYONE for their suggestions... I'll keep everyone informed as I work thru it.

[phatdaddy]

Should be 7 wires on module

White & blue/white. Pump motion sensor
Black. Ground
Brown. Temp sensor
Blue. Oil reservoir
Purple. Power supply 12 vt
Green. To switch box

[Destroyer]

Originally Posted by phatdaddy

Should be 7 wires on module

White & blue/white. Pump motion sensor
Black. Ground
Brown. Temp sensor
Blue. Oil reservoir
Purple. Power supply 12 vt
Green. To switch box

Thanks Phat.. That makes it a little easier. :)

[garbubba]

Nothing wrong with checking all that out.

If the alarm isn't going through self-test at startup though, there can be no doubt about it being bad. Unless I'm mistaken it doesn't even address the sensor inputs until AFTER the POST - power on self test.

[Destroyer]

Originally Posted by garbubba

Nothing wrong with checking all that out.

If the alarm isn't going through self-test at startup though, there can be no doubt about it being bad. Unless I'm mistaken it doesn't even address the sensor inputs until AFTER the POST - power on self test.

Now that makes sense. I never thought about the alarm's POST and it's significance. If, when I turn the key, it just automatically starts sounding without going thru it's POST first then it makes sense that, just like a computer's motherboard, something's wrong with the unit before you even get to the other sensors.

[Destroyer]

Originally Posted by captpete13

the alarm module is bad

Was sorta thinking the same thing, but wanted opinions before I spent $$$