Warning tone fix

[baylake07]

I have seen quite a few warning tone threads fro Mercury engines.
I had one that was similar to many that I have read:
Warning tone would sound when the key was turned, engine cold or hot.
It would sound even after starting. I had it looked at, and the problem was
with the warning control module. It was emitting the tone as it was simply in need of replacement. It was also due to the low oil detector, which was bad.
I don't recomend the following fix for you as being permanent. Should you have a faulty low oil warning tone, disconnect one on the blue wires leading from the bottom of the oil resevoir. This will at least stop the warning tone for low oil. If you do not have it fixed, you run the risk of running out of oil without detection. Get it replaced as soon as possible to protect your engine properly. The replacement warning module was just under 100.00. New oil resevoir was just over 80.00.

 

[WillyBWright]

Re: Warning tone fix

If you had a cold motor beep beep beep, it was probably the float in the oil tank (assuming you have a Merc inline). If the beep beep beep went away with the blue wire(s) disconnected, the warning module was probably okay. If you had a constant Beeeeeep and it went away with the blue wire(s) disconnected, it was both. It would be unusual if both were problematic simultaneously, but both are known to develop problems and it certainly is a possibility. The warning module problem might have existed without you knowing it long before the oil tank problem surfaced.

There is a float in the oil tank that has a magnet in it that operates the low oil switch with the two blue wires. The magnet can fall out or the float can stop floating. Alas, you can't just replace the float, you have to replace the whole darn tank.

The warning module takes the low oil signal and chops it up into a beep beep beep to differentiate overheat and low oil conditions. I suppose that module might fail to chop up the beep, but I've never personally experienced it. It is an electronic device, after all, and electronics tend to fail any way they have a mind to.

Glad your problem was solved and no serious damage to the powerhead occurred (which these parts wouldn't do). Happy Boating.