"That system,like was stated h
"That system,like was stated has 2 sensors,The reservoir on the engine and at the oil pump.The warning system is also connected to one of the switch boxes and this tells the system is running.If the switch box fails in this cylinder,the warning horn will also sound.If this is the first time this engine has run after winter lay up or after an extended period of time,there was a problem with the oil being thick and causing an added load on the bushing under the oil pump,this added load will cause the plastic gear on the crankshaft to tear up and no longer work.if this is the case,you can check this by removing the oil pump and removing the oil pump drive gear.if this is the problem.there will be small fragments of plastic on the drive gear and you can see the crankshaft gear with a flash light.If it is damaged,and you have it repaired,be sure to have the plastic bushing replaced also as they now make them .002 smaller so as not to have this problem.By the way,the wire connected to the switch box is a green wire.It is usually connected to the outer switch box."