The large variety of applications this voltage is used for makes it common
for most of the recreational vehicle and automotive industries. The danger from
shocks with this voltage is minimized, but can still occur. A good example of
this is when a magnetic field is generated, then collapses when the power sup-
ply is turned off. The result is an electrical discharge that can reach tens of
thousands of volts for a short time period. Care should be used when working
with this voltage as current values can be quite high, as in the case of a battery
cables.
Warning: Shorting a battery cable to ground with a battery
at a reasonable state of charge can result in a fire or serious
personal injury from a burn.
One of the most widely used tools used for testing a 12 Volt problem is the
test light. Many different types of test lights are available, such as a light bulb
with a probe and ground clip, to the more elaborate electronic ones that meas-
ure 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 digi-
tal format. Either of these two testing tools may be used, depending upon per-
sonal preference. If a 12 Volt light is not working, the test light may be better
suited for this. In the event of a charging system problem, where exact voltage
values need to be obtained, the meter may be the tool of choice. In any situation
the testing tool is an invaluable piece of equipment when it comes to determin-
ing an electrical problem.
Should it become necessary to use testing tools, take certain precautions and
consider three things. First, recognize when the problem is beyond your skill
level. Nothing will create more mayhem than being armed with tools and going
in an unknown direction. Good intentions may lead to major problems. The sec-
ond item to keep in mind is if something will cause more grief by being dealt
with now, than if it were left alone and repaired by a professional at a more
convenient time. How many times have you said to yourself, “Oh this will only
take a few minutes,” only to find it is taking an entire day and you wished you
had not touched it? The third item to consider is whether or not the current situ-
ation may become 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.
Electrical Systems - House
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