Alternator Disassembly; Bridge Rectifier Test - Jeep 1987 Wrangler Workshop Manual

ELECTRICAL
CHARGING SYSTEM - DELCO
Bridge Rectifier Test
Test Procedure
The bridge rectifier assembly contains six
diodes. If one diode is defective, the entire
bridge rectifier assembly must be replaced.
C A U T I O N : Do not use a high voltage test
device, such as a 110-volt test lamp, to test the
bridge rectifier.
NOTE: Press down firmly on the flat metal area
surrounding the thread studs with the ohmmeter
test probes.
Firmly touch the ohmmeter test probes to
the grounded heat sink (A) and any one of
three terminals. Note the resistance (B).
C D
B D
84916A
Reverse the ohmmeter test probe contacts to
the grounded heat sink and the same terminal.
Note the resistance.
Repeat the procedure for the remaining two
terminals.
In the same manner as described above, test
between the insulated heat sink (C) and each of
the three terminals (D).
Test
Results
Each combination of the terminal and heat sink
tested should have one high and one low
resistance. Replace the bridge rectifier, if any
one pair of resistance indications is the same.
N O T E : Replacement bridge rectifiers may
vary in a p p e a r a n c e but are completely
interchangeable.
ALTERNATOR DISASSEMBLY
CAUTION: As the rotor and drive end (front)
housing assembly is separated from the rear
housing assembly the brushes can spring out
onto the rotor shaft and come in contact with
lubricant. Immediately clean the brushes that
contact the shaft to avoid contamination by
lubricant, otherwise, they will have to be
replaced.
NOTE: All bolt and screw threads are in metric
dimensions.
Scribe across the front housing, stator frame
and rear housing for assembly reference.
Remove the four through-bolts that connect the
rear housing to the front housing.
Separate the front housing and rotor assembly
from the rear housing and stator assembly by
prying the housings apart with a screwdriver.
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