Owner`s manual
OPERATION — PAGE 27WILLIS POWER SYSTEMS
Recognizing a Blown Fuse
A blown fuse is common, although it does not happen often it is usu-
ally the rst place to look when diagnosing your system.
To check a fuse, pull the fuse out of the fuse box, and look carefully
at the lament inside the plastic shell. If there is a break in the la-
ment, the fuse is blown as shown in image two below.
Image 1 - Working Fuse Image 2 - Blown Fuse
WARNING: Do not install the incorrect fuse size.
A fuse will regulate the power to components of your APU system.
It protects those components from overheating, power surges, and
it keeps your system running properly. On occasion, a fuse will fail
whether it is from wear over time or from other variables.
Changing a blown fuse is simple, but you must remember two very
important rules before changing or installing a fuse.
1. A Fuse with Insufcient Amps is Bad
A fuse with insufcient amperage will blow more frequently and will
have to be changed quite often. Because it can’t handle the required
power, it can blow immediately after attempting to run the system.
2. A Fuse with Too Much Amps is Worse
Installing a fuse with higher than recommended amperage can, and
most likely will cause serious damage to the component. A proper
size fuse prevents any electrical damage to the wiring system and to
the components of the APU system.