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CRAFTSMAN
Wiringdiagramor schematic
A wiring or a schematic diagram, and the ability
to read it are very important in troubleshooting
a
circuit. The diagram shows how the circuit was
designed and what paths the electricity is sup-
pose to flow.
Fused jumper
wires
Fused jumper wires are handy to help find bad
grounds or to jump across switches for testing
purposes.
CAUTION: Only use fused jumper wires. If there
is a short in the circuit, using an unfused jump
could damage components in the circuit.
Test lights (high impedance)
Test lights are used as a quick way to verify volt-
age at a point in a circuit. Like DMMs, they come
in a wide variety from many manufacturers.
The most basic test lights simply use the current
being checked to light an incandescent lamp.
These should not be used on any equipment
that has or may have solid-state circuitry.
The power necessary to light the bulb is more
than many solid-state circuits were designed to
handle. Components will be destroyed in the
process of testing them. See Figure 7.32.
NOTE: Do not use a test light on a 900 series
tractor. It can damage the RMC module.
Figure 7.32
If a test light is used at all, it should have "high-
impedance",
indicating that it only takes a sam-
ple of the electricity being tested, and illuminates
an LED to indicate the presence of power.
Some high impedance test lights are capable of
indicating whether the current being sampled is
AC or DC.
Battery Jumper Cables
The obvious use: jumper cables can be used to
jump-start equipment to get it into the shop. This
is not recommended for any fuel injected Kohler-
powered equipment.
The clever use: If the technician suspects that
there is resistance on the ground side of the sys-
tem, a quick-and-dirty test can be made using
jumper cables.
Connect one cable clamp to the negative post of
the battery, and connect the clamp at the other
end of the same cable to the engine block.
If there is an immediate difference in starter
motor performance, use the voltage drop tech-
nique discussed later in this section to identify
the source of the resistance.
Ammeters and specialized charging system testers
Inductive ammeters are available in many forms.
Some are as simple as a gauge to be held
against the circuit in question when it is ener-
gized. See Figure 7.33.
Page 24
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