Temperature Gauge: Description and Operation

Circuit Description

Engine Coolant Temperature Gauge
The pointer of the engine coolant temperature gauge moves by the magnetic field of two coils. The coils are at right angles to each other. Battery voltage is applied to the coils through fuse 2, generating a magnetic field. The magnetic field, controlled by the engine coolant temperature sender, causes the gauge's needle to move. As the resistance in the sender varies, current through the gauge coils change.