Voltage Regulator - TM-10-3930-633-120047

TM 10-3930-633-12

and slip the drive belt off the alternator pulley.

(1) Locate the voltage regulator, which is

mounted just to the left of the steering column in

See figure 4-35.

the engine compartment.

(3) Tag and disconnect the alternator wiring

from the terminals in the rear of the alternator.

(2) Remove the socket head screw from the

top of the regulator cover.

(4) Remove the alternator adjusting arm

bolt. Remove the alternator mounting bolt, nut

(3) Insert a screwdriver blade through the

and washer from the front housing and pivot

hole and engage the switch which is inside.

bracket.

(4) To set the regulator for a higher charging

rate, turn the screw to the next setting on the

(5) Remove the alternator from the vehicle.

b. Installation.

"+" side.

(1) Place the alternator in position in the

(5) To set the regulator for a lower charging

rate, turn the screw to the next setting on the

lower bracket, aligning the through hole in the

front housing with the hole in the pivot bracket.

"-"

side.

(2) Install the long mounting bolt, nuts, and

(6) Replace t h e s o c k e t h e a d s c r e w i n

regulator cover when adjustment is complete.

washers, and tighten securely.

(3) Install the adjusting arm bolt, but do not

c. Replacement.

(1) Disconnect the battery ground cable.

tighten.

(2) Tag and disconnect the wiring to the

(4) Connect the alternator wiring to the

regulator terminals.

terminal studs in the rear housing, observing

(3) Remove the regulator mounting screws,

carefully the tagged notations.

and the regulator from the bracket.

(5) Install drive belt over pulley and adjust

(4) Position the new regulator against the

belt tension as outlined in paragraph 4-66.

bracket, and install mounting screws.

(6) Tighten adjusting arm bolt securely.

(5) Hook up wiring to the regulator.

(7) Connect battery ground cable.

(6) Connect battery ground cable. Adjust

4-28. Voltage Regulator

regulator as outlined in subparagraph b above.

a. Test. To test the voltage regulator, make

4-29. Starter

certain that the alternator output is satisfactory

a. General. The starter is a 12-volt unit that

by first performing the alternator output test as

has the solenoid mounted on the starter housing

outlined in paragraph 4-26. If alternator per-

(fig. 4-9). The solenoid is energized when the

formance is known to be satisfactory, the only

starter relay contacts are closed. This action

other cause for charging system malfunction is a

engages the starter drive with the flywheel ring

maladjusted or defective regulator. If adjustment

gear, starting the engine. An overrunning clutch

does not bring voltage regulator performance

in the drive protects the starter from excessive

within specifications, the regulator must be

speed when the engine starts. The starter current

replaced.

flows through the solenoid energizing coil until

b . Adjustment. The alternator regulator

the solenoid plunger is at the end of its travel. The

adjustment is set at the factory for average

plunger then closes a set of contacts that by-pass

operating conditions. The regulator may have to

the energizing coil, letting the holding coil keep

be readjusted to keep the batteries fully charged

the starter drive engaged.

u n d e r the particular operating conditions.

Proceed as follows:

4-21