8-10 CHARGING SYSTEM — Alternator
7. Remove the brush holder assem
bly in the following manner.
a. Remove the brush lead wires
from the holder.
b. Remove the terminal insulators .
c. Remove the stator coil MN n
terminal lead from the holder.
When removing the brush holder
assembly, do not remove it by
cutting the "N 11 terminal lead or
melting the solder.
F ig .8-13 Removing Brush V1141
Holder
Inspection & Repair
Bearing
Check the bearings for scores, rough
ness, abnormal noise or damage.
If defective, replace the bearing/s.
Rotor
1. Check the rotor coil for open or
short circuit.
Connect a circuit tester from the
slip ring to the other ring.
The coil resistance should be 3 . 5
to 3.7 ohms on the RS , RT43L,
RT52L and RK171B series, and
4.1 ~ 4.3 ohms on RK series
except on RK171B series.
If there is little or no resistance,
the coil or slip rings indicate a
short or ground, and considerably
higher than that specified above,
indicates an opened coil or con
nection defect.
If the test shows that the rotor
coil is shorted or opened, and the
slip rings are defective, the rotor
assembly should be replaced.
Fig. 8-14 Testing Rotor Coil V2196
for Open & Short Circuit
2. Connect the tester from the slip
ring to the rotor or rotor shaft,
and check the insulation between
them.
If the tester needle moves, the
rotor coil or slip rings are de
fective .
The rotor assembly should be re
placed .
Fig. 8-15 Testing Rotor V2197
Coil for Ground
Stator
1. Check the stator coil for insulation .
Connect the tester between the
stator coil lead and the stator core.
If the tester needle moves, the
coil insulation is defective.
Repair the coil or replace the
stator assembly.
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