Alternator Replacement; Rectifier Bridge Test - Jeep 1979 CJ-5 Technical & Service Manual

CHARGING SYSTEM 1E-9
O H M M E T E R
O H M M E T E R
BRUSH CONNECTOR
I N S U L A T I N G
WASHERS
RECTIFIER
BRIDGE
A T T A C H I N G
NUTS
DIODE
T R I O
7 0 1 6 0
Fig. 1E-9 Rear Housing Assembly
Test with Diode Trio Removed
(1) Remove diode trio from rear housing assembly.
(2) Connect ohmmeter having 1-1/2 volt cell to
single brush connector and one stator lead connector
(fig. 1E-10). Observe reading on lowest range scale.
(3) Reverse leads to same two connectors.
(4) Replace diode trio if two readings are same.
Good diode trio will give one high and one low reading.
(5) Repeat steps 2, 3, and 4 for each stator lead
connector of diode trio.
(6) Connect ohmmeter to two connectors. If reading
is zero, open diode is indicated. Replace diode trio. Re-
peat test for each combination of stator lead connectors.
Rectifier Bridge Test
The rectifier bridge contains six diodes, three positive
and three negative. If one diode is defective, the entire
rectifier bridge must be replaced.
N O T E : Do not use high voltage, such as a 110-volt test
lamp, to check this unit.
(1) Connect ohmmeter to grounded heat sink and
one of three terminal tabs (fig. 1E-11). Note reading.
(2) Reverse ohmmeter lead connections to grounded
heat sink and same terminal tab. Note reading.
O H M M E T E R
STATOR LEAD CONNECTORS
7 0 1 6 1
Fig. 1E-10 Testing Diode Trio
(3) Repeat steps (1) and (2) for remaining two ter-
minal tabs.
(4) In same manner, test between insulated heat
sink and each of three terminal tabs.
Test Results
Each combination of terminals tested should give one
high and one low reading. Replace rectifier bridge if any
one pair of readings is the same.
ALTERNATOR REPLACEMENT
Removal
WARNING: Failure to disconnect battery negative
cable may result in injury from battery lead at the
alternator.
(1) Disconnect battery negative cable.
(2) Disconnect two-terminal plug and battery cable
at back of alternator.
(3) Remove mounting and adjusting screws and
washers.
(4) Remove alternator drive belt from alternator
pulley and remove alternator from mounting bracket.
(5) Remove pulley from alternator.
installation
(1) Install original pulley on r e p l a c e m e n t
alternator.