Auto Repair Advice by Professional Automotive Experts
Diagnostic Testing /
Test Light
How to Use a Test Light
A test light is used to check the continuity of an electrical circuit. A test
light utilizes a bulb held in a probe attached to a sharply pointed rod. This design
is optimal for piercing a
wire, testing a
fuse or checking the surface charge of
a battery. A test light is easy to use, first connect the ground clip to a ground
source, the battery negative terminal is best but any clean grounded metal source
will work. Then connect the pointed end of the test light to desired circuit to
be tested. If power is present the bulb will illuminate informing you the circuit
is operating properly. Also you can reverse the test light lead to the positive
be able to check for system ground continuity. (Note: A test light should be
used for basic electrical circuits only. Do not use a test light to check
computer related circuits, a
voltmeter
should be used in these cases.)
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