ENGINE ELECTRICAL ± Charging System
16-10
EXAMPLES OF ABNORMAL WAVEFORMS
NOTE
1. The size of the waveform patterns differs largely, depending on the adjustment of the variable knob
on the analyzer.
2. Identification of abnormal waveforms is easier when there is a large output current (regulator is not
operating). (Waveforms can be observed when the headlamps are illuminated.)
3. Check the conditions of the charging warning lamp (illuminated/not illuminated). Also, check the charging
system totally.
Abnormal waveforms Problem
cause
Abnormal waveforms Problem cause
Example 1 Open diode Example 4 Short in stator
coil
Example 2 Short in diode
Example 5 Open
supplementary
diode
Example 3 Broken wire
in stator coil
At this time, the charging warning lamp
is illuminated.
ALTERNATOR RELAY CONTINUITY CHECK
1. Remove the alternator relay from the relay box inside
the instrument panel.
2. Set the analogue-type circuit tester to the Ω range and
check that there is continuity when the (+) terminal of
the tester is connected to terminal 2 of the alternator relay
and the (±) terminal is connected to terminal 4.
3. Next, check that there is no continuity when the (+) terminal
is connected to terminal 4 and the (±) terminal is connected
to terminal 2.
4. If the continuity checks in steps 2 and 3 show a defect,
replace the alternator relay.
1
2
3
4
Alternator
relay
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