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together the BAT and ARM terminals of the
2. Voltage of the generator must be kept
g e n e r a t o r regulator with a jumper wire, or a
high enough to insure sufficient current output, but
screwdriver blade, just long enough to cause a
below operating voltage of regulator unit.
spark.
(5) After any test of adjustments, generator on
t h e vehicle must be polarized after leads are
4-47. Generator Regulator
connected, but before the engine is started (para 4-
a. General.
46 C(2)). This allows a momentary surge of current
(1) Mechanical checks and adjustments (air
to flow through generator which correctly polarizes
gaps, point opening) must be made with battery
it. Failure to do this may result in severe damage
d i s c o n n e c t e d and preferably with regulator off
since reversed polarity causes vibration, arcing, and
vehicle.
burning of relay contact points.
Caution: Cutout relay contact points
b. Removal.
must never be closed by hand with battery
(1) Open hood, remove panel from left side of
connected to regulator. This would cause a high
engine
compartment
and
open  b a t t e r y c o m -
current to flow through the units which would
partment door.
seriously damage them.
(2) Disconnect battery ground lead.
(2) Electrical checks and adjustments may be
(3) Disconnect and tag leads from BAT,
made either on or off vehicle if a test bench is
FLD, and ARM terminals at regulator.
available. Regulator must always be operated with
( 4 ) Remove three nuts, lockwashers, and
generator for which it is designed.
screws that secure regulator and capacitor to left
Caution: When removing and installing
side panel and remove regulator and capacitor.
cover, exercise care to prevent touching cover
c. Installation. Reverse procedures in b above.
on circuit breaker which would cause a short
d. Testing and Adjusting. Prior to electrically
circuit and damage regulator assembly.
testing the generator regulator, check and adjust
(3) Regulator must be mounted in operating
the cutout relay armature air gap and contact point
position when electrical settings are checked and
opening (subpara (1) (a) and (1) (b) below), and
adjusted and it must be at operating temperature.
the voltage regulator armature air gap (subpara (2)
Operating temperature for regulator checking and
(a) below) and the current regulator armature air
adjusting is reached after 15 minutes of continuous
gap (subpara (3) (a) below). Electrically test and
operation of regulator with 1/4 ohm resistance in
a d j u s t cutout relay before testing voltage and
series with battery, and with regulator cover in
current regulator portions of generator regulator.
place. It is not necessary to measure amount of
W i t h cutout relay operating properly, voltage
c u r r e n t flowing during warm-up or testing of
regulator portion can be electrically tested and
v o l t a g e unit, however, it is important that no
adjusted and finally current regulator portion can
electrical load other than ignition be turned on
be electrically tested and adjusted.
during test. (If a variable resistor is used in series
(1) Cutout relay. The cutout relay requires
with the battery, set to 10 amperes for warm-up
three checks and adjustments, as follows:
period).
(a) Air gap. With battery disconnected,
(4) Specified generator speeds for testing and
measure air gap between armature and center of
adjusting.
core (fig. 4-23). If adjustment is required, bend
(a) Voltage  regulator:  engine  governed
armature stop (fig. 4-24) up or down until correct
speed.
air gap reading of 0.025 to 0.027 inch is obtained.
(b) Current  regulator.
Be certain armature stop does not interfere with
1. Generator must be operated at a speed
armature alignment.
sufficient to produce current in excess of specified
setting.
4-30

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