Skytech

Industry Training

ST39 Electrical System Schematic Interpretation (4 days)

The apprentice is able to trace current flow through circuits with the use of an electrical schematic. Upon successful completion, the apprentice is able to: Define wiring fundamentals. Describe circuit construction features of chassis electrical and power accessory systems using schematics. Explain the principles of operation of chassis and power accessory systems. Outline the inspection and testing procedures for electrical and power accessory systems.

Module Content:

1. Review wiring fundamentals
   • wiring gauge numbers, colour
     • temperature effects of current flow though a conductor
     • SAE wire specifications
     • AWG wire specifications
2. Describe the construction features of chassis electrical and power accessory systems
   • wiring
   • lighting
     • lighting circuits
     • headlamp circuits
     • clearance circuits
   • wiper circuits
   • blower motor circuits
   • warning and monitoring devices for:
     • temperature
     • pressure
     • vacuum
     • engine speed
     • noise
     • fuel supply
     • charging
   • engine shut down systems
   • engine starting aid circuits
     • glow plugs
     • manifold heaters
     • starting fluid injection circuits
3. Explain the principles of operation of chassis electrical and power accessory systems
   • wiring circuits
   • lighting
     • signal circuits
     • headlamp circuits
     • clearance circuits
   • wiper circuits
   • warning and monitoring devices for:
     • temperature
     • pressure
     • vacuum
     • engine speed
     • noise
     • fuel supply
     • charging
   • engine shut down
   • engine starting aid circuits
     • glow plugs
     • manifold heaters
     • starting fluid injection circuits
4. Perform inspection and testing procedures following manufacturers recommendations and perform assigned operations for chassis electrical and power accessory systems
   • trace wiring circuits using manufacturers wiring diagrams
   • perform a demonstration of wiper and warning system component tests
   • identify circuit protection devices
   • develop a chronological sequence to trace wiring faults
   • perform a demonstration of instrumentation troubleshooting
     • scanner
     • visual

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Sudbury, Ontario
Canada P3A 3V8

(705) 566-8101

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