Escort L4-98 1.6L SOHC VIN 5 FI (1985)
Instrument Panel Voltage Regulator: Description and Operation
The Constant Voltage Regulator (CVR) type indicator is a bi-metal resistance type system consisting of an Instrument Voltage Regulator (IVR), an
indicator gauge, and a variable resistance sending unit. Current to the system is applied to the gauge terminals by the IVR, which maintains an average
pulsating value of 5 volts. The indicator gauge consists of a pointer which is attached to a wire-wound bi-metal strip. Current passing through the coil
heats the bi-metal strip, causing the pointer to move. As more current passes through the coil, heat increases, moving the pointer farther. The circuit is
completed through a sending unit which contains a variable resistor. When resistance is high, less current is allowed to pass through the gauge, and the
pointer moves very little. As resistance decreases due to changing conditions in system being monitored, more current passes through gauge coil, causing
pointer to move farther.
