Multi Meter; Electrical System Fundamentals; Voltage - Cub Cadet Challenger Series Service Manual

Multi meter

A multi meter (Figure 34) is an
essential tool for electrical system
diagnosis. The voltage function
indicates the voltage applied or
available to various electrical
components. The ohmmeter function
tests circuits for continuity, or lack of
continuity, and measures the resistance
of a circuit. Some manufacturer's
specifications for electrical components
are based on results using a specific
test meter. Results may vary if using a
meter not recommended by the
manufacturer. Such requirements are
noted when applicable.
Ohmmeter (analog) calibration
Each time an analog ohmmeter is used
or the scale is changed, the ohmmeter
must be calibrated. Digital ohmmeters
do not require calibration.
1. Make sure the meter battery is in
good condition.
2. Make sure the meter probes are in
good condition.
3. Touch the two probes together and
observe the needle location on the
ohms scale. The needle must align
with the 0 mark to obtain accurate
measurements.
General Information
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4. If necessary, rotate the meter ohms
adjust knob until the needle and 0
mark align.
Electrical System
Fundamentals
A thorough study of the many types of
electrical systems used in today's UTV's
is beyond the scope of this manual.
However, a basic understanding of
electrical basics is necessary to perform
simple diagnostic tests. Refer to
Electrical Testing in Chapter Two for
typical test procedures and equipment.
Refer to Chapter Ten for specific system
test procedures.

Voltage

Voltage is the electrical potential or
pressure in an electrical circuit and is
expressed in volts. The more pressure
(voltage) in a circuit the more work can
be performed.
Direct current (DC) voltage means the
electricity flows in one direction. All
circuits powered by a battery are DC
circuits.
Alternating current (AC) means the
electricity flows
momentarily and then switches to the
opposite direction. Alternator output is
an example of AC voltage. This voltage
must be changed or rectified to direct
current to operate in a battery powered
system.
in one direction