Title: Test turn signal and hazard circuit flasher(s), switches, relays, bulbs/LEDs, sockets, connectors, terminals, wires, and control components or modules.
Course: Diesel Equipment Technology II (20107-II) > Section: Electrical/Electronic Systems: Servicing the Lighting Systems

Testing should include

- checking for the proper function of bulbs including cracked, broken, or hazy lenses, lights that will not hold adjustment, and dull reflectors
- checking for the proper function of bulbs, flashers, turn signals, and hazard switches
- testing related components
- referring to service materials and manufacturer guidelines.

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

Process/Skill Questions:

- What is the function of the flasher?
- What condition might cause a taillight to go out when a signal light flashes?
- What could cause flashing that is too rapid or too slow?