Title: Test the headlight and dimmer circuit switches, relays, wires, terminals, connectors, sockets, and control components/modules.
Course: Diesel Equipment Technology II (20107-II) > Section: Electrical/Electronic Systems: Servicing the Lighting Systems

Testing should include inspection, based on

- manufacturer guidelines
- a description of normal operation
- the interpretation of appropriate wiring diagrams.

ASE 2: V. Electrical/Electronic Systems: E. Lighting System (P-3)

ASE 2: V. Electrical/Electronic Systems: F. Instrument Cluster and Driver Information Systems (P-2)

Process/Skill Questions:

- What are common reasons for headlight or dimmer switch failure?
- What is the difference between a normally opened and a normally-closed switch?
- How is a relay tested?