Operation CHARM: Car repair manuals for everyone.

Use of Circuit Testing Tools

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

- 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.