ELECTRICAL SYSTEM
10C-7
SECTION 10C. GENERAL INSTRUCTIONS
GENERAL
Repair of the electrical system is generally limited to
the replacement of defective components or wiring.
Wiring diagrams and Component Location illustrations
are provided in Section 10Q for troubleshooting and
testing the electrical system. Specific repair and
replacement instructions, where applicable, are also
provided.
NOTE:
The test instrument shown in the illustrations for
this section is a digital multimeter (DMM). How-
ever, any test instrument capable of measuring
the current resistance and continuity values speci-
fied is acceptable.
NOTE:
See the engine manufacturer’s service manual for
information on engine electrical components not
covered in this section.
In addition to testing a suspected faulty component, it
may be necessary to check for shorts or breaks in the
wiring to the component. A common method of testing
wires or circuits is to perform a continuity check as
described below.
NOTE:
Before performing any component or wiring test,
check for corrosion and loose or missing connec-
tions.
If a component (switch, relay, etc.) is removed for test
or replacement, make sure to identify and label all
wires so that the component can be reinstalled cor-
rectly.
Using A Multimeter
A multimeter can be used to test electrical systems for
proper operation. This section describes the multimeter
settings used for the various tests performed in the
section. The multimeter illustrations show a typical mul-
timeter, see Figure 10C-1.
The multimeter settings include:
• Resistance (Ohms) – The ability of a material
to oppose the flow of current (amps).
•Continuity (—|←) – Test a wire, switch, or
other device to determine if the device has an
open circuit that will not allow current to pass.
• DC Voltage (VDC) – Used to test the amount
of DC voltage passing through a circuit.
Figure 10C-1. Typical Multimeter Settings
Resistance Ω (Ohms)
200K Shown
Continuity - Includes Ohm
Reading and Buzzer
DC volts - 20 VDC Shown
10C
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