Module 3: Automotive Electrical Basics ● Battery, alternator, and starter systems ● How to use a multimeter ● Reading basic wiring diagrams ● Common electrical failures Module 4: Professional Diagnostics ● How to diagnose instead of guessing ● Proper scan tool usage ● Check Engine Light explained ● Symptoms vs. root causes ● Step-by-step diagnostic process Module 5: Brakes, Suspension & Steering