Basic Knowledge Required

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 properly.
If you need a review of basic electrical troubleshooting knowledge, refer to Diagnostic Aids. This contains helpful information including the basic use of circuit testing tools.

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 be familiar with the Digital Multimeter (DMM) J 39200 and be familiar with the meter controls and how to use them correctly.
^ You should be able to measure voltage, resistance and current.
^ You should know how to use jumper wires to bypass components for testing circuits.

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