but this is a normal reaction when
t h e s e adjustments are being made.
It is also advisable to periodically
(b) Slide the safety clip (33-B) off the
check the rate of current charge on
s t o p button (33-C) to open the ac
battery charge rate read switch
test stand. This is an essential pro-
( 6 0 ) , as the current output of the
battery charger will vary when the
be in an open condition and will not
battery charger is in operation over
operate.
a period of time. If the current
(c) T u r n the voltage selector switch
reading has dropped, turn the vari-
(41-A) to the "6V" position. Turn
able control (47) clockwise until the
the knurled knob on the lower sec-
c o r r e c t current output is indicated
t i o n of the battery charge timer
on the load dc ammeter.
(46) fully counterclockwise to reset
(g) T h e battery charger will automati-
the timer and open the battery
cally turn itself off when the battery
c h a r g i n g circuit.
charge timer (46) has timed out
Note. Turning the knurled knob fully
c o u n t e r c l o c k w i s e is an important proce-
w h i c h will be indicated when the
dure to follow, otherwise the battery
battery charge indicator lamp (45)
charging circuit will not function properly.
goes out or the battery charger can
(d) Turn the knurled knob on the bat-
be timed out if desired by turning
t e r y charge timer clockwise to a
the knurled knob on the timer fully
s p e c i f i e d time (see manufacturer's
counterclockwise.
s p e c i f i c a t i o n s and/or TM 9-6140-
(h) T o disconnect the battery charge
200-15) and depress the red button
circuit completely, rotate the battery
o n the battery charger timer (46)
charge circuit variable control (47)
a n d the battery charge indicator
f u l l y counterclockwise. Place the
l a m p (45) should light up. Rotate
battery on-off switch (41-B) in the
t h e battery charge circuit variable
" O F F " position and disconnect the
c o n t r o l (47) counterclockwise or
complete hook-up (4, fig. 9) to the
clockwise until the voltage reading
e x t e r n a l dc voltmeter positive and
negative binding posts (29) and the
m a t e l y 2 volts below the voltage
battery charge positive and negative
reading of 6 volts on the dc volt-
binding posts (2, fig. 9) and the
meter (5), a (2) above.
"-6" and "+ 12" connections lo-
(e) Turn the battery on-off switch to the
c a t e d in the battery compartment
"ON" position and push the lever of
(fig. 9). Place the batteries back in
the battery charge rate read switch
the battery compartment if removed
(60) up to "READ" position to
for electrolyte check.
c h e c k the amperage output of the
(2) 12-Volt battery charging procedures.
battery charger on the load dc am-
The procedures for charging the 12-
m e t e r (1). The battery charge cir-
volt battery system of the test stand is
c u i t variable control (47) can be
the same as prescribed in b(1) above,
t u r n e d counterclockwise or clock-
e x c e p t the voltage selector switch
wise to obtain the specified ampere
(41-A) is set in the "12V" position,
o u t p u t reading on the dc ammeter
( s e e manufacturer's specification
(22) in the "20V (X2)" position, and
a n d / o r TM 9-6140-200-15) for the
t h e battery charge circuit variable
b a t t e r y charger.
control (47) is adjusted until approxi-
( f ) The voltage reading on the dc volt-
m e t e r (5) will advance when ad-
m a t e l y 2 volts reading is indicated
j u s t i n g the variable control (47),
below the 12 volt rating of the battery