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the proper polarity, the low resistance allows current
the proper polarity, the low resistance allows current
to flow from the alternator to the battery. The high re-
to flow from the alternator to the battery. The high re-
sistance prevents current from flowing from the battery
sistance prevents current from flowing from the battery
to the alternator. Because of the high resistance which
to the alternator. Because of the high resistance which
does not allow current to flow from the battery back
does not allow current to flow from the battery back
through the alternator, no circuit breaker is required
through the alternator, no circuit breaker is required
as in the D.C. regulator. The alternating current is
as in the D.C. regulator. The alternating current is
converted by the rectifiers to direct current and flows
converted by the rectifiers to direct current and flows
into the battery circuit.
into the battery circuit.
CAUTION:
CAUTION:
ways be
ways be
sure
sure
only is
only is connected t
connected to o groun
installed and connected backwards may re-
installed and connected backwards may re-
sult in
sult in burning out
burning out the
2. TESTING THE ALTERNATOR SYSTEM
2. TESTING THE ALTERNATOR SYSTEM
(On Vehicle)
(On Vehicle)
With the battery fully charged and in good condition
With the battery fully charged and in good condition
and engine at normal operating temperature, proceed
and engine at normal operating temperature, proceed
with the test as follows:
with the test as follows:
CAUTION: Never ground the alternator field
CAUTION: Never ground the alternator field
circuit as this will result in damage to the
circuit as this will result in damage to the
voltage
voltage
regulator.
regulator.
C C harging C
harging C ir irc c uit
( 1) Disconnect the wire from the "BAT" terminal
( 1) Disconnect the wire from the "BAT" terminal
of the alternator.
of the alternator.
(2) Connect a O-50 ampere scale D.C. test ammeter
(2) Connect a O-50 ampere scale D.C. test ammeter
in series with the alternator "BAT" terminal and the
in series with the alternator "BAT" terminal and the
wire which was disconnected from the alternator
wire which was disconnected from the alternator
"BAT" terminal.
"BAT" terminal.
NOTE: The ammeter leads and the test
NOTE: The ammeter leads and the test
meter
meter
must be in good condition and all con-
must be in good condition and all con-
nections should be clean and tight.
nections should be clean and tight.
(3) Connect a voltmeter (calibrated in tenths) posi-
(3) Connect a voltmeter (calibrated in tenths) posi-
tive lead to the "BAT" wire that was disconnected from
tive lead to the "BAT" wire that was disconnected from
the alternator and connect the voltmeter negative lead
the alternator and connect the voltmeter negative lead
to the battery positive post.
to the battery positive post.
(4) Start the engine and adjust the engine speed to
(4) Start the engine and adjust the engine speed to
produce 10 amperes from the alternator. The voltage
produce 10 amperes from the alternator. The voltage
reading should not exceed .2 .2 volt. If there is higher
reading should not exceed
voltage drop, clean and recheck charging circuit re-
voltage drop, clean and recheck charging circuit re-
sistance. A voltage drop test across each connection
sistance. A voltage drop test across each connection
will locate any bad connections.
will locate any bad connections.
C C ur
urrent
rent Output
Output J J est
( 1) Disconnect the battery ground cable.
( 1) Disconnect the battery ground cable.
(2) Disconnect the field lead at the alternator and
(2) Disconnect the field lead at the alternator and
at the regulator.
at the regulator.
(3) Connect a O-50 ampere scale D.C. test am-
(3) Connect a O-50 ampere scale D.C. test am-
meter in series with the alternator "BAT" terminal and
meter in series with the alternator "BAT" terminal and
the wire disconnected from the alternator "BAT" ter-
the wire disconnected from the alternator "BAT" ter-
minal.
minal.
TEMPERATURE
TEMPERATURE
IN DEGREES
IN DEGREES
Minimum
Minimum Setting
When
When
installing
installing
a
a
the negative post
the negative post
of of
ground. d. A A battery
battery that is
the rectifiers.
rectifiers.
uit R R esis
esist t anc
anc e T
e Test
est
volt. If there is higher
est
0 " 0 "
Setting
1 1 4 4
carbon pile rheostat) across the battery.
carbon pile rheostat) across the battery.
(6) Connect the test voltmeter positive lead to the
(6) Connect the test voltmeter positive lead to the
altern
alternator
ator "BAT"
meter negative lead to the alternator housing.
meter negative lead to the alternator housing.
(7) Connect the battery ground cable.
(7) Connect the battery ground cable.
(8) Install a tachometer, start the engine and ad-
(8) Install a tachometer, start the engine and ad-
just the
just
the engine
(9) Adjust carbon pile to maintain 15 volts on test
(9) Adjust carbon pile to maintain 15 volts on test
voltmeter while making tests. Turn off immediately
voltmeter while making tests. Turn off immediately
al-
al-
when test is completed. The current output should be
when test is completed. The current output should be
battery,
battery,
the
the
battery
battery
within the limits shown in "Specifications". If the out-
within the limits shown in "Specifications". If the out-
put is slightly lower (3 to 4 amperes) it may be an in-
put is slightly lower (3 to 4 amperes) it may be an in-
that is
dication of a possible "open" rectifier or other alter-
dication of a possible "open" rectifier or other alter-
nator internal problems. If the output is considerably
nator internal problems. If the output is considerably
lower, it may be an indication of a possible "shorted
lower, it may be an indication of a possible "shorted
rectifier or other alternator internal problems. In either
rectifier or other alternator internal problems. In either
case the alternator should be removed and tested on
case the alternator should be removed and tested on
the bench before disassembly.
the bench before disassembly.
Before the alternator is removed and while the am-
Before the alternator is removed and while the am-
meter is connected in circuit it is possible to test the
meter is connected in circuit it is possible to test the
rotor field current draw. Stop the engine. Note the re-
rotor field current draw. Stop the engine. Note the re-
verse current reading on the ammeter, and the battery
verse current reading on the ammeter, and the battery
voltage reading on the voltmeter. The rotor field coil
voltage reading on the voltmeter. The rotor field coil
draw should be 2.38 amperes to 2.75 amperes at 12
draw should be 2.38 amperes to 2.75 amperes at 12
volts. If the test ammeter does not have a reverse cur-
volts. If the test ammeter does not have a reverse cur-
rent scale, reverse the test ammeter leads at the "out-
rent scale, reverse the test ammeter leads at the "out-
put" terminal and field terminal on the alternator.
put" terminal and field terminal on the alternator.
A low rotor field coil draw is an indication of high
A low rotor field coil draw is an indication of high
resistance in the field coil circuit; may be brushes,
resistance in the field coil circuit; may be brushes,
slip rings or field coil connections. A high rotor field
slip rings or field coil connections. A high rotor field
coil draw indicates a possible shorted field coil.
coil draw indicates a possible shorted field coil.
am-
am-
Volt
Voltag
age R
( 1) Disconnect jumper lead from the alternator
( 1) Disconnect jumper lead from the alternator
"field" terminal and "BAT" terminal.
"field" terminal and "BAT" terminal.
(2) With engine at normal operating temperature,
(2) With engine at normal operating temperature,
connect the test ammeter in series with the alternator
connect the test ammeter in series with the alternator
"BAT" terminal and the wire disconnected from alter-
"BAT" terminal and the wire disconnected from alter-
nator "BAT" terminal.
nator "BAT" terminal.
(3) Connect the test voltmeter positive lead to the
(3) Connect the test voltmeter positive lead to the
alternator battery "BAT" terminal and ground the volt-
alternator battery "BAT" terminal and ground the volt-
meter negative lead to the alternator housing or reg-
meter negative lead to the alternator housing or reg-
ulator base.
ulator base.
NOTE: No current reading on test ammeter
NOTE: No current reading on test ammeter
would indicate a blown
would indicate a blown
the voltage regulator between the
the voltage regulator between the
tionary contact
tionary contact
new
new
fusible wires must be securely soldered
fusible wires must be securely soldered
at upper and lower connections (Fig. 4).
at upper and lower connections (Fig. 4).
(4) Start the engine and adjust the engine speed to
(4) Start the engine and adjust the engine speed to
1250 rpm and with ammeter reading 10 amperes by
1250 rpm and with ammeter reading 10 amperes by
turning on lights etc. Operate for 15 minutes to
turning on lights etc. Operate for 15 minutes to stabi-
EL
EL EC
ECT T RIC
RICA A L- L-IN
INST
ST RU
RU MENT
MENT S S
2
2 5 5 " "
4 4 8 8 " "
1 1 3 3 . . 9 9
1 1 3 3 . . 9 9
"BAT" term
terminal a
inal and gro
nd ground t
engine speed
speed to to 1250
1250 rpm.
rpm.
e Regulator
egulator J J est
est (On Vehic
(On Vehic le)
f fu u se se
and
and
the "IGN" terminal. The
the "IGN" terminal. The
7o"
7o"
9 9 5 5 " "
1 1 3 3 . . 7 7
1 1 3 3 . . 6 6
und the te
he test vol
st volt- t-
le)
wire inside of
wire inside of
sta-
sta-
upper
upper
stabi-
3 3 7 7
1 1 1 1 8 8 " "
1 1 4 4 0 0 " "
1 1 3 3 . . 5 5
1 1 3 3 . . 4 4
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