4-44 4262930-Rev A
ELECTRICAL
4
Component Testing
Electrical System and Component
Testing
!
WARNING
General Information
Repair of the electrical system, for the most part, is
limited to the replacement of defective components or
wiring. Wiring diagrams are provided in this section for
troubleshooting and/or testing the electrical system.
Specific component testing and replacement information,
where applicable, is also provided 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 in the following tests.
NOTE
Before performing any component or wiring tests, check
for corrosion and loose or missing connections.
If a component (switch, relay, etc.) is removed for testing
or replacement, be sure to identify and label all wires so
that the component can be installed correctly.
Continuity Test
1. Identify and locate the wire or component to be
checked using the electrical schematic.
NOTE
Some meters may have a continuity tester setting that
uses a buzzer to indicate continuity. See the meter
operator’s manual for more information.
2. If using a multimeter, set it to read ohms or set meter
to continuity setting.
3. Disconnect the ends of the wire being tested.
4. Touch meter leads to the ends of the wire or to the
terminals of the component to be tested.
Does meter read less than 0.02 ohm, and/or does
the buzzer sound?
YES The wire is good.
NO Proceed to step 5.
5. Use a known good jumper wire of the correct gauge
to bypass the wire in question.
6. Test the function of the circuit.
Does the circuit now operate properly?
YES Replace the wire.
NO Continue testing other wires and
components in the circuit.
Resistance Test
1. Identify and locate the wire or component to be
checked using the electrical schematic.
NOTE
On some meters it will be necessary to select an ohms
scale. Select an appropriate range for the component
being tested. Refer to the specifications listed in the
component test procedure.
2. If using a multimeter, set it to read ohms.
3. Isolate (disconnect) the component to be tested from
the circuit to prevent a false reading through the
circuit.
4. Connect the meter leads to the terminals of the
component being tested. Check the component test
procedure for specifications and additional test
conditions.
Does the resistance through the component
match the specified value listed in the test
procedure?
YES The component is good.
NO Replace the component.
Before cleaning, adjusting, or repairing this
equipment, disengage mow switch, engage park
brake, move key switch to the off position, and
remove key to prevent injuries.
When performing maintenance other than
adjustments that require the reel and/or traction
motors to be running, disconnect the battery
pack/gen-set plug to prevent accidental motor
engagement and bodily injury.
Required Tools or Equipment
Digital Multimeter, Ohmmeter, or Continuity Tester
Required Tools or Equipment
Digital Multimeter or Ohmmeter
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