Electrical fuses protect vulnerable
electrical circuits from shorts and burnt wiring. There is basically only one way
a fuse can fail and that is, for at least a second there was a short circuit to
ground that caused the fuse to blow. Most vehicles fuse panels are located
under the hood or under the dash
and is labeled with specific amperage ratings and the circuit the fuse protects.
Always replace failed fuses with the proper amp fuse; not doing so can result in
electrical system damage.
Step 1 - Identify Fuses, Control Relays, Micro Relays and Main Fusible
Links
Fuse Panel
This is a main electrical junction box; most electrical components are supplied
and protected though this box. If an electrical component short circuits it will
blow a fuse in this box in most cases. The
control relay and micro control relay are used as a high amperage switch for
devises that require high amounts of amperage for an extended amount of time. The
fuse or fusible link supply voltage to sub electrical systems.
Step 2 - Testing Fuses and Main Fusible Links
Testing Car Fuses
There are two ways to check fuses the first is the good old fashion way of removing
each fuse and visually inspecting each fuse. It's time consuming but effective.
And the easy way, but you need a "test
light" before you can begin. Turn the key to the "on" position (do not start),
ground your test light lead to a good ground source, like a metal brace under the
dash, seat mount bolt or under hood brace. Then lightly touch the service port at
the top of the fuse on both sides. If the test light illuminates on both sides of
the fuse, the fuse is ok and working properly. If the fuse lights the test light
on one side it is blown and needs to be replaced.
If further assistance is needed, our certified car repair technicians are ready
to answer your car questions.
Common Problems
- The wrong amperage fuse is installed causing wiring damage.
- Fuses can cause intermitted short circuit by becoming loose or corroded
in the fuse holder. Make sure fuse is held securely and is free of dirt and
corrosion.
Related Car Repair Information
