Electrical Systems - House --- Section 8
The Executive 2005
363
Tools of the Trade
One of the most widely used tools for testing a 12 Volt DC problem is the test light. Test lights
come in a host of varieties, such as a light bulb with a probe and ground clip, to the more elaborate
electronic ones that measure a wide scale of voltages and perform a variety of functions. A VOM or
Volt Ohm Meter is used to perform a multitude of tests. It is generally used when exact values are
needed for evaluation. These meters come in an analog or digital format. Either of these two testing
tools may be used, depending upon personal preference. If a 12 Volt DC light is not working, the test
light may be better suited for this. In the case of a charging system problem the meter may be the tool
of choice. In any situation the testing tool is an invaluable piece of equipment when it comes to
determining an electrical problem.
Knowing When to Say When
Should it become necessary to use testing tools, take precaution and consider three things:
1. Recognize when a problem is beyond your skill level. Attempting a repair without knowl-
edge of it can lead to major problems.
2. Would the repair be cost effective and cause less problems than if it were repaired by a pro-
fessional at a later date? How many times has a repair seemed simple enough only to find
it has taken an entire day?
3. Would the current situation be potentially dangerous if left to be repaired at a more conven-
ient time?
NOTE:
Check all related fuses before assuming you have encountered an electrical problem
or situation. Spare fuses should be kept on hand and can be purchased from auto parts
stores. A fuse description label is on the distribution panel cover.
WARNING:
If a fuse blows replace the fuse with same amperage rating and type. Installing higher
amperage fuses can damage the wiring or the item the fuse is protecting, or may cause
a fire. If the fuse repeatedly blows after replacing it do not continue to replace it.
Have the problem diagnosed and corrected by a qualified technician.
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