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10-34
GENERATING SYSTEM
ELECTRICAL SYSTEMS
(310)
TURN
SCREW CLOCKWISE
TO
r - - - -
INCREASE,
O
R
CO
UNTER·C
LOCK·
W
ISE
TO DECREASE
VO LTAG E
TURN SCREW CLOCKW ISE
TO
INCREASE,
O
R COUNTER·
ClOCKWISE
TO DECRE ASE
CHARG E RATE
Figure 10-26-Current and Voltage Regulator Spring Tension
Adjustments-1949 Series
50-70
bend hanger up to decrease voltage. Adjust to
7.4 volts. See figure 10-24.
If
a slight adjust-
ment of one spring does not provide proper
setting, the regulator should be removed for a
complete
readjustment.
(b)
On 1949 S
eries
50-70, turn adjusting
screw clockwise to increase voltage or counter-
clockwise to decrease voltage. Adjust to 7.4
volts. See figure
10-26.
Th
e
final setting must
always
be made
by in
creasing
the spring
ten-
sion and voltage,
never
by reducing
the
spring
tension.
If
adjusting screw is turned clockwise beyond
normal
range
required for adjustment, the
spring support may
be bent
so that it fails to
return
wh
en pressure
is r
elieved.
If
this hap-
pens,
turn
the screw
counterclockwise until
suffici
ent clearance
exist s between screw head
and spring support, then bend spring support
upward
carefully
until conta ct is made with
screw
head.
Make final
adjustment
as
described
above.
5. After each
adjustment
of spring ten-
sion, and before taking voltage reading, install
regulator
cover
with
gasket
in proper position
and run engine at 1500 RPM until regulator is
hot.
Gradually reduce engine speed until cut-
out relay points open, then bring engine speed
back to 1500 RPM. Adjust resistance until am-
'
met er reads 8-10 amperes at 1500 RPM and
take voltage reading.
6. Disconnect test equipment and connect
wire to "BAT" terminal. Polarize generator
before again starting engine
(subpar.
d,
below).
Set engine speed at 450 RPM.
d. Polarizing Generator
After any tests or adjustments of regulator,
or replacement of regulator or
generator,
the
generator on the
vehicle
must be polarized
after all leads are
connected
but
before
th
e
en-
gine is
started.
Momentarily connect a
j
umper lead or screw
driver between the "BAT" and "GEN" t
er-
minals of regulator. This allows a momentary
surge of current to flow through the
generator
which correctly
polarizes
it.
Failure to polarize the generator may result
in severe damage to the equipment since r
e-
versed polarity causes vibration, arcing and
burning of the relay contact
points.
10-30
GENERATO R REGULATOR
REPA IRS
- ON BENCH
The contact points of a r
egulator
will become
oxidized and pitted
after
ext ended
service
and
require
cleaning. Contact points also may be
burned because of faulty
connections
in the
charging circuit, shorts or grounds in the
gen-
er at or field circuit, or installation of a radio
by-pass condenser on
the "
F " t
erminal
of gen-
er at or or regulator.
The majority of regulator
troubles arise
from dirty and oxidized contact
points, which
cause a reduced g
en erator
output.
Cleaning
of
contact points, or
replacem ents
if badl
y burned,
followed
by adjustment of air gap and spring
tension will
correct
faulty regulator operation
in most
cases . Cleaning
of points and adjust-
ment of regulator should not
be attempted
with
unit on the car;
remove
r
egulator
so that this
work can be don
e properly.
a. Cleaning Regulator Contact Points
Loos
en the upper
contact support
mountin g
screws
on
voltag e a
nd current r
egulators a
nd
tilt support to on
e
sid
e so
that ea ch point can
be cleaned separately without
danger
of
bend-
ing
the
upper contact
spring. Use
a thin.
fine-
cut
file
on the
crowned
point on contact
support,
and use a spoon or riffl
er
file to clean out the
cavity which is usually formed in the flat con-
tact point on the armatu re
o
See figure
10-27. A
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