Title: Test the gauge circuit sensor/sending units, gauges, connectors, terminals, and wires.
Course: Diesel Equipment Technology I (20107-I) > Section: Electrical/Electronic Systems: Servicing the Gauges and Warning Devices

Testing should include

- inspecting, testing, and replacing the oil temperature and pressure switches and sensors
- checking the operation of the parking brake indicator light system
- checking the operation of the brake stop light system and adjusting and servicing as needed
- diagnosing intermittent, high, low, or no gauge readings
- testing the gauge circuit voltage regulators (limiters) and replacing as needed
- inspecting and testing gauges and gauge-sending units and replacing as needed
- inspecting and testing connectors, wires, and printed circuit boards of gauge circuits and repairing or replacing as needed
- diagnosing the incorrect operation of warning devices and other driver information systems
- diagnosing intermittent, high, low, or no readings on electronic instrument clusters
- inspecting and testing sensors, sending units, connectors, wires of electronic instrument circuits, and repairing or replacing as needed.

Process/Skill Questions:

- How would a balancing-coil gauge system be described?
- How would a gauge sending unit be tested?
- What is the purpose of the instrument voltage regulator (IVR)?