RAM 1500 Van V6-3.9L VIN X (1997)
Temperature Gauge: Description and Operation
Circuit Operation
CIRCUIT OPERATION
Circuit G20 connects the engine coolant temperature gauge to the engine coolant temperature sensor. The sensor is a variable resistor and case
grounded to the engine. Circuit F14 from fuse 18 in the fuse block connects to the instrument cluster and supplies voltage for the gauge.
As current flows through the coils in the gauge, it creates a magnetic field. One of the coils in the gauge receives fixed current. The other coil is
connected to the temperature gauge on circuit G20. A change in temperature changes the resistance in the sensor which alters the current flow
through the second coil in the gauge. A change in current flow alters the magnetic field in the gauge, which changes the pointer position.
