Written by a mechanic for real world, hands-on testing
Voltage drop explained - Corrosion causes - Batteries/Testing explained - relays, potentiometers, resistors, solenoids
Voltmeters explained - finding shorts to ground -Battery draws explained
How to Read Schematics - Applies to Automotive, Heavy-Duty, Equipment, Machinery, Marine
Every page of this very popular guide has been translated into Spanish