Note. The key numbers shown below in
and, after all leads are connected,
disconnect the lead from the
otherwise indicated.
"FIELD" terminal ("B" terminal)
(a) Turn all range selector switches be-
of the generator regulator and mo-
neath the meters on the test stand
mentarily touch this lead to the gen-
to the maximum reading position,
erator regulator "BATTERY" ter-
all rheostats fully counterclockwise,
minal ("A" terminal). This allows
and all on-off toggle switches to
a momentary surge of current to
the "OFF" position (some toggle
flow through the generator field coils
switches have center position as off)
so that the generator is correctly
polarized.
(b) Mount the generator to be polarized
Caution: Always disconnect the
(if not already mounted for other
field terminal lead from the regu-
tests) on the test stand (high speed
lator when touching battery termi-
or low speed driving head (4 and 5,
nal on the generator regulator dur-
fig. 7)) as
required (par. 94), and
ing polarizing procedures. Never
connect to the generator input bind-
apply battery voltage to the field
terminal of the generator regula-
test stand, refer to specific test,
tor, such as shorting from the bat-
tery terminal to field terminal of
(c) Connect a test lead number 38425
the generator regulator, or by con-
necting a jumper wire directly
volts positive (red) binding post
and a test lead number 38425 to the
field terminal. This action causes
dc variable external volts negative
excessive current to flow from the
(black) binding post (28-C).
battery through the generator reg-
(d) Connect the test lead, (c) a b o v e ,
ulator contacts to ground, thus
from the dc variable external volts
burning the points.
positive (red) binding post (28-C)
(b) External ground field type (stand-
to the "F" generator input binding
the generator regulator on the ve-
(e) Connect the test lead, (c) a b o v e ,
hicle and connect a jumper lead
from the dc variable external volts
momentarily between the "ARMA-
negative (black) binding post
T U R E " and "BATTERY" termi-
(28-C) to the ground (GND) bind-
nals of the generator regulator (re-
ing post (10-E, fig. 15).
lay on third brush generators) after
leads have been reconnected but be-
s e l e c t o r switch (22) is in the
f o r e the engine is started. This
"50V (X5)" position and place the
allows a momentary surge of cur-
rent to flow through the generator
(23) in the "VARIABLE VOLTS"
so that it is correctly polarized.
position.
Caution: Determine the type gen-
Caution: Be sure the dc variable
erator (internal or external ground
power supply control (48) is in the
field) before attempting to repolar-
fully counterclockwise position.
ize it since using the wrong polar-
(g) Place the variable external volts on-
izing will result in reversed gen-
off switch (28-A) in the "ON" posi-
erator polarity and serious damage
tion.
to the electrical equipment, (1)
(h) Place the polarity reversing switch
above, will occur.
(50) in the "POS GND" or "NEG
GND" position (position of this
switch will vary according to system
stand (heavy-duty system).