Alternator Relay Continuity Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

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
Example 1
Example 2
Example 3
Alternator relay
1
3
ENGINE ELECTRICAL –
Problem
cause
Open
diode
Short in
diode
Broken
wire in
stator coil

ALTERNATOR RELAY CONTINUITY CHECK

1. Remove the alternator relay from the relay box inside
2. Set the analogue-type circuit tester to the Ω range and
3. Next, check that there is no continuity when the (+) terminal
4. If the continuity checks in steps 2 and 3 show a defect,
2
4
Charging System
Abnormal waveforms
Example 4
Example 5
At this time, the charging warning lamp
is illuminated.
the engine compartment.
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.
is connected to terminal 4 and the (–) terminal is connected
to terminal 2.
replace the alternator relay.
16-13
Problem cause
Short in
stator coil
Open
supple-
mentary
diode
16100190045