8-34
HOW TO DIAGNOSE
Power
supply
s
Fuse
ON
(2)
Switch
I
OFF
I,/---.
Motor
(1)
Q
16A0260
GENERAL ELECTRICAL SYSTEM CHECKS
A circuit consists of the power supply, switch, relay, load,
ground, etc. There are various methods to check a circuit
including an overall check, voltage check, shortcircuit check
and continuity check. Each of these methods is briefly
described in the following.
‘d
1. VOLTAGE CHECK
(1) Ground one lead wire of the test light. If a voltmeter is
used instead of the test light, ground the grounding side
lead wire.
(2) Connect the other lead wire of the test light to the
power side terminal of the switch connector. The test
light should come on or the voltmeter should indicate a
voltage.
(3) Then, connect the test light or voltmeter to the motor
connector. The test light should not come on, or the
voltmeter should indicate no voltage. When the switch
is turned on in this state, the test light should come on,
or the voltmeter should indicate a voltage, with motor
starting to run.
(4) The circuit illustrated here is normal but if there is any
problem such as the motor failing to run, check voltages
beginning at the connector nearest to the motor until
the faulty part is identified.
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