4-03
Charging System
4-03
If field is shorted. excessive current would for through
Voltage indicated is usually 13.9 to 14 7 volts depending
meter and possible damage would result
on regulator ambient temperature High voltage may be
due to a poor ground connection. If ground connection is
not faulty, regulator will require replacement.
TEST 5 - FIELD TERM DISCONNECTED
VOLTAGE REGULATOR PLUG DISCONNECTED
BATTERY TERMINAL SHORTED TO FIELD
TERMINAL
IGNITION ON - ENGINE RUNNING AT IDLE
This test isolates defect to either the alternator or
regulator If voltage alt iuxiir5 terminal rises to 15-16 volts
FIG. 5. Field Draw Test - Ignition Off
now, when it did not in Test 4 with regulator connected,
TEST 4 - IGNITION ON - ENGINE RUNNING AT
then defect is in regulator and it should be replaced. If
FAST IDLE
voltage does not rise at auxiliary terminal. defect is in
(Refer to Figure 6)
alternator stator or rectifier diodes.
If field circuit
checked out properly For defects in stator or diodes,
remove, alternator.
FIG. 6. Ignition On-Engine Running at Fast Idle
FIG 7. Field Term Disconnected Volt Reg Plug
Disconnected Bat Term Shorted to Fld Term Ignition On
Engine Running at Idle
3.
Apply pressure on the alternator front
ADJUSTMENTS
housing only and tighten the adjusting arm to
BELT ADJUSTMENTS
alternator bolt
1.
Check the belt tension with Tool 1'63L-8620-A
4.
Check the belt tension using Tool T631L-8620-
The belt should be within specifications
A. Adjust the belt for specified tension.
(Specifications Section).
5.
Tighten all mounting bolts.
2.
If the belt is not within specifications. loosen the
alternator mounting bolt to a snug position and
Installation
loosen the adjusting arm bolts.
1.
Install the alternator wiring harness Position the
alternator to the engine. and install the spacer
REMOVAL AND INSTALLATION
(fused} and the alternator mounting bolt. Tighten
the bolt only finger tight.
Removal
2.
Install the adjustment arm-to-alternator attaching
1.
Disconnect the battery ground cable
bolt.
2.
Loosen the alternator mounting bolts and
3.
Position the belt on the pulley and adjust the belt
remove
the
adjustment
arm-to-alternator
tension using Tool T631.-8620-A Apply pressure
attaching bolt.
on the alternator front housing only, when
3.
Remove the electrical connectors from the
tightening the belt Tighten the adjusting arm bolt
alternator.
and the mounting bolt.
4.
Disengage the alternator belt
Remove the
4.
Connect the battery ground cable.
alternator mounting bolt, and remove the ,
