Basic Knowledge Required

Before using this section, it is important that you have a basic knowledge of the following items. Without this basic knowledge, it will be difficult to use the diagnostic procedures contained in this section.

^ Basic Electrical Circuits - You should understand the basic theory of electricity and know the meaning of voltage, current (amperes) and resistance (ohms). You should understand what happens in a circuit with an open or shorted wire. You should be able to read and understand a wiring diagram.
^ Use of Circuit Testing Tools - You should know how to use a test light and how to use jumper wires to bypass components to test circuits. You should be familiar with the J 39200 High Impedance Digital Multimeter (DMM). You should be able to measure voltage, resistance and current and be familiar with the meter controls and how to use them correctly.

Important: When measuring the resistance to ground of a circuit or component, make sure to use a solid, unpainted chassis ground or the negative battery terminal.