Heavy Equipment Electrician Course

Lesson 1 • Electrical Safety Fundamentals

Introduces lockout/tagout, arc flash awareness, and PPE selection for equipment electrical work. Safety practices established here apply throughout the entire course.

Lesson 2 • DC Power Systems Overview

Examines 12V and 24V DC architectures common in heavy equipment. Students identify how battery banks supply starting, charging, and accessory loads.

Lesson 3 • Reading Electrical Schematics

Teaches interpretation of OEM wiring diagrams, symbol conventions, and wire numbering systems. Schematic fluency is prerequisite to every diagnostic chapter that follows.

Lesson 1 • Batteries and Starting Systems

Covers battery chemistry, capacity ratings, and cranking circuit operation. Students connect battery condition directly to reliable machine starting performance.

Lesson 2 • Switches, Relays, and Fuses

Details the role of control switches, relay logic, and overcurrent protection in machine circuits. Students select correct fuse ratings and relay types for given loads.

Lesson 3 • Lighting and Accessory Circuits

Covers work lights, beacon systems, horn circuits, and heated component wiring. Students calculate accessory load totals and verify circuit protection adequacy.

Lesson 4 • Sensors and Actuators

Introduces pressure, temperature, and position sensors alongside solenoid actuators. Students map sensor signals to gauge, warning, and control system responses.

Lesson 1 • Multimeter Operation and Applications

Teaches DC/AC voltage, resistance, continuity, and diode testing with a digital multimeter. Accurate meter use is the foundation of every electrical diagnosis performed later.

Lesson 2 • Electronic Scan Tools and Software

Covers OEM and aftermarket scan tool connection, fault code retrieval, and live data streaming. Students use scan data to narrow faults before performing component-level tests.

Lesson 3 • Oscilloscope Use on Equipment Circuits

Introduces waveform capture for sensor signals, PWM outputs, and communication bus activity. Students interpret time-domain signals that multimeters cannot adequately display.

Lesson 4 • Specialized Diagnostic Equipment

Introduces load testers, insulation resistance testers, and circuit tracers for heavy equipment. Students match specialized tools to specific fault types identified in prior sections.

Lesson 1 • Crimping and Soldering Techniques

Teaches proper crimp tool selection, die sizing, and pull-test verification alongside soldering best practices. Quality terminations are critical to long-term reliability in harsh environments.

Lesson 2 • Connector Types and Identification

Identifies Deutsch, AMP, Metri-Pack, and weatherproof connector families used on heavy machines. Students match connectors to OEM specifications before performing any repair.

Lesson 3 • Harness Repair and Splice Methods

Demonstrates OEM-approved splice techniques, butt connector use, and harness section replacement. Students restore harness integrity to original specification after damage or corrosion.

Lesson 4 • Harness Routing and Protection

Covers loom selection, conduit routing, clamp spacing, and chafe protection for equipment harnesses. Proper routing prevents mechanical damage that causes intermittent electrical faults.

Lesson 1 • Cranking Circuit Voltage Drop Testing

Teaches voltage drop measurement across cables, connections, and solenoid contacts during cranking. Excessive drop is isolated to specific conductors and corrected before component replacement.

Lesson 2 • Battery Testing and Maintenance

Covers load testing, conductance testing, and electrolyte inspection for flooded and AGM batteries. Battery condition directly determines the validity of all subsequent starting system tests.

Lesson 3 • Charging Circuit Fault Isolation

Traces undercharge and overcharge conditions through wiring, regulators, and battery interactions. Students use a structured decision tree to reach root cause without unnecessary parts replacement.

Lesson 4 • Alternator Output Testing

Measures alternator voltage output, ripple, and current capacity under full electrical load. Students confirm charging system adequacy before clearing undercharge or overcharge complaints.

Lesson 1 • Fault Code Diagnosis and Prioritization

Teaches fault code retrieval, active vs. inactive code distinction, and diagnostic priority sequencing. Students avoid chasing secondary codes caused by a single root-cause fault.

Lesson 2 • ECM Programming and Parameter Setting

Covers flash programming procedures, parameter configuration, and post-programming verification steps. Students follow OEM protocols to update or replace ECMs without causing new faults.

Lesson 3 • Sensor Signal Diagnostics

Diagnoses open, short, and out-of-range sensor faults using scan tool data and oscilloscope waveforms. Students distinguish sensor failures from wiring faults and ECM input failures.

Lesson 4 • Electronic Control Module Fundamentals

Covers ECM inputs, outputs, power supply, and ground requirements for heavy equipment controllers. Students verify ECM supply quality before attributing faults to the module itself.

Lesson 1 • Pressure and Flow Sensor Diagnostics

Diagnoses hydraulic pressure transducers and flow sensors that feed ECM control loops. Accurate sensor data is required for correct proportional valve command output.

Lesson 2 • Solenoid Valve Testing and Service

Covers resistance measurement, current draw testing, and bi-directional activation of hydraulic solenoids. Students isolate electrical faults from mechanical valve failures using measured data.

Lesson 3 • Load-Sensing and Implement Control Circuits

Examines load-sensing signal wiring, implement enable relays, and joystick control circuits. Students trace implement faults from operator command through electrical and hydraulic stages.

Lesson 4 • Electrohydraulic Control Fundamentals

Explains how ECMs command proportional and on/off solenoid valves to control hydraulic flow and pressure. Students trace the signal path from operator input to hydraulic output.

Lesson 1 • Advanced Oscilloscope Diagnostics

Uses oscilloscope math channels, cursors, and protocol decoding to analyze complex waveforms. Students identify signal degradation, timing errors, and communication anomalies invisible to scan tools.

Lesson 2 • Systematic Diagnostic Process

Establishes a repeatable six-step diagnostic process from complaint verification to confirmed repair. Consistent process application reduces diagnostic time and prevents repeat failures.

Lesson 3 • Diagnostic Report Writing

Covers professional documentation of findings, test data, root cause statements, and corrective actions. Accurate reports support warranty claims, fleet records, and technician accountability.

Lesson 4 • Multi-System Fault Interaction Analysis

Examines how faults in one system generate secondary symptoms in connected systems. Students build fault interaction maps to avoid replacing parts that are victims, not causes.