Water Temperature Contactor
A water temperature contactor switch is located in the cooling
system. This unit is non-adjustable. Thermal expansion of the
element operates a micro-switch that can be used to signal an
operator or control a device. The water temperature element
must be in contact with the coolant. After an overheated
engine is allowed to cool, the contactor automatically resets
Oil Pressure Switch
An oil pressure switch is located in the oil system. This switch
has three terminals and can serve a dual purpose. This switch
senses the oil pressure. When the oil pressure falls below a
preset pressure the switch deactivates. When the pressure
rises again beyond a preset pressure the switch reactivates.
This switch can be used to signal an operator that the engine
oil pressure has dropped.