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
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
voltage does not rise at auxiliary terminal. defect is in
(Refer to Figure 6)
If field circuit
checked out properly For defects in stator or diodes,
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
Apply pressure on the alternator front
housing only and tighten the adjusting arm to
Check the belt tension with Tool 1'63L-8620-A
Check the belt tension using Tool T631L-8620-
The belt should be within specifications
A. Adjust the belt for specified tension.
Tighten all mounting bolts.
If the belt is not within specifications. loosen the
alternator mounting bolt to a snug position and
loosen the adjusting arm bolts.
Install the alternator wiring harness Position the
alternator to the engine. and install the spacer
REMOVAL AND INSTALLATION
the bolt only finger tight.
Install the adjustment arm-to-alternator attaching
Disconnect the battery ground cable
Position the belt on the pulley and adjust the belt
tension using Tool T631.-8620-A Apply pressure
on the alternator front housing only, when
Remove the electrical connectors from the
tightening the belt Tighten the adjusting arm bolt
and the mounting bolt.
Disengage the alternator belt
Connect the battery ground cable.
alternator mounting bolt, and remove the ,