Ranger 4WD V6-183 3.0L (1993)
Oil Pressure Warning Lamp/Indicator: Description and Operation
PURPOSE
Many trucks utilize a warning light on the instrument panel in place of the conventional dash indicating gauge to warn the driver when the oil
pressure is dangerously low.
OPERATION
The oil pressure switch contains a diaphragm and a set of contacts. When the ignition switch is turned "ON", the warning light circuit is energized
and the circuit is completed through the closed contacts in the pressure switch.
When the engine is started, build-up of oil pressure compresses the diaphragm, opening the contacts, thereby breaking the circuit and putting out
the light.
