Some further explanation:
The oil sending unit, not to be confused with the oil sensor, is a "ground switch". It is tapped into the oil supply port in the engine block. When the switch is under pressure the circuit for the light in your dash is broken, that is the ground is not connected. Ergo, the light is out.
If the oil pressure drops below a predetermined point the switch is allowed to make contact, and thus ground the circuit. The light goes on.
To test the circuit simply put the ingnition switch in the on position (KOEO). The light should light up because the engine is not running, and oil pressure is zero.
If the light fails to go on you have either a burnt out bulb, a bad connection, or a wire problem (broken, shorted, disconnected, corroded, etc).
If the light goes on while you are running the engine (KOEO,)then you either have very low oil pressure, a failed switch, or a grounded circuit. If there is even a drop of oil on the switch ("sending unit") it is leaking and should be replaced. (Unless the oil has leaked onto it from a leaking valve cover, but then you should see a trail of oil from above the switch)
The most common failures are 1. the bulb burned out, 2. leaking or failed switch, 3. the wire to the sending unit has becone disconnected, has a poor connection, or has been rubbed through and grounded.
Dave,
Yes I'm from Brunswick, and yes, we have met as Bizzy has stated. I think you were distracted by one of the young ladies sitting near you. Bizzy maybe? naughty shrug rangerj
The investment you make at OU will pay you dividends for the rest of your life. "Spend" your time wisely.
