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Electrical Fundamentals
Voltage, amperage, resistance, power, Ohm's Law, series circuits, parallel circuits, and circuit behavior.
View Fundamentals → Automotive training for students & technicians
Automotive Technology Explained Clearly.
Practical automotive electrical training, diagnostics, scan tools, and electrical theory built around understanding what you are testing—not memorizing procedures.
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Learn Automotive Technology
Build the theory first, then connect it to the tests and diagnostic decisions technicians make.
02
Electrical Diagnosis
Voltage drop, DMM use, circuit testing, wiring diagrams, opens, shorts, excessive resistance, and diagnostic strategy.
View Diagnostics →03
Scan Tools & Case Studies
Scan-tool operation, trouble codes, data interpretation, testing decisions, and real diagnostic examples.
View Case Studies →Technician Tools
Automotive Electrical Tools
Use calculators and reference tools built around the electrical measurements technicians actually work with.
CurrentOhm's LawVoltage, current, resistance, and power.
CurrentUnit ConverterVolts, millivolts, amps, milliamps, ohms, kilohms, and more.
AvailableSeries / ParallelCircuit values and unknown resistance.
MemberFuse CurrentFuse voltage-drop current reference tool.
Watch & Learn
Featured Lessons
Start with some of the most useful BTAT lessons covering wiring diagrams, Ohm's Law, and real diagnostic reasoning.
Automotive Electrical
How to Read Automotive Wiring Schematics for Beginners
Learn a practical approach to reading automotive wiring diagrams and following the circuit before choosing a test.
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Automotive Electrical
Ohm’s Law Made Simple for Automotive Technicians
Connect voltage, current, and resistance to the measurements and circuit behavior technicians actually diagnose.
Watch on YouTube →
High-Voltage Diagnosis
Chevy Volt Won’t Charge P0AA6! Diagnosing a High Voltage Isolation Fault with the KINGBOLEN K7
Follow a Chevrolet Volt P0AA6 high-voltage isolation-fault diagnosis using scan data and a structured testing approach.
Watch on YouTube →About Bill
Automotive Experience. Classroom Focus.
Bill brings experience as an automotive technician, dealership service manager, and automotive technology instructor to Bill Teaches Automotive Technology.
The goal is simple: explain automotive systems in a way that helps you understand what you are testing and why the test matters.
Automotive Technician Experience
Dealership Service Management
College Automotive Instruction
Faith & The Toolbox
Faith Is Part of Who I Am.
My Christian faith shapes how I approach my family, my work, my teaching, and the way I treat others.
More importantly, I believe that forgiveness, hope, and eternal life are found through Jesus Christ. My faith is not simply part of my background; it is the foundation of how I understand life, purpose, and what ultimately matters.
That connection led me to write Toolbox Truths: Devotions From Under the Hood, a 365-day devotional for automotive technicians and tradesmen of faith.
Prefer Video?
Watch automotive electrical lessons, diagnostic case studies, tool demonstrations, and technician training on YouTube.