6H-8 CHARGING SYSTEM
3) Ground F terminal and start engine, then measure voltage at
B terminal as shown in left figure.
Voltage is higher than standard value
It is considered that generator itself is good but IC regulator
has been damaged, replace IC regulator.
Voltage is lower than standard value
Generator itself has problem, check the generator.
LOAD CHECK
1) Run engine at 2,000 rpm and turn on head light and heater
motor.
2) Measure current and if it is less than 20 A repair or replace
generator.
OVERCHARGED BATTERY
1) To determine battery condition, refer to Battery section.
2) If obvious overcharge condition exists as evidenced by
excessive spewing of electrolyte, measure generator B ter-
minal voltage at engine 2000 rpm.
3) If measured voltage is higher than upper limit value, disas-
semble generator.
4) Check ground of brushes. If brushes are not grounded,
replace IC regulator. Then check field coil for grounds and
shorts.
A: Regulated voltage (V)
B: Heatsink temperature (°C)
16.0
15.5
14.2 15.3
14.8
14.2
13.314.8
15.0
14.5
14.0
13.5
13.0
-30 0 25 135
[A]
[B]
CHARGING SYSTEM 6H-13
2) Using ohmmeter, check that there is no continuity between
coil leads and stator core. If there is continuity, replace sta-
tor.
BRUSH AND BRUSH HOLDER
Check each brush for wear by measuring its length as shown. If
brush is found worn down to service limit, replace brush.
Exposed brush length “a”
Standard: 10.5 mm (0.41 in.)
Limit: 1.5 mm (0.06 in.)
RECTIFIER
1) Using an ohmmeter, connect one tester probe to the “B” ter-
minal (1) and the other to each rectifier terminal (2).
2) Reverse the polarity of the tester probes and repeat step 1).
3) Check that one shows continuity and the other shows no
continuity.
If there is continuity, replace the rectifier.
4) Using an ohmmeter, connect one tester probe to each nega-
tive terminal (1) and the other to each rectifier terminal (2).
5) Reverse the polarity of the tester probes and repeat step 4).
6) Check that one shows continuity and the other shows no
continuity.
If there is continuity, replace the rectifier.
