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13-24
GROUP
13-CHARGING SYSTEM
ALTERNATOR
REGULATOR
IGN.
SWITCH
BATTERY
FIG. 31 -Field Circuit- Upper Contacts Closed
IN CAR TESTS AND ADJUSTMENTS
Voltage regulator tests.
Before attempting to assess the
performance of the voltage regulator
always carry out an alternator out-
put test
-
see page 13-7
Accurate test equipment must be
used.
The voltage regulator tests must
be carried out with a fully charged
battery;
with the regulator at normal
operating temperature
;
and with the
cover in place.
Regulating voltage
test.
Fig. 27
1.
Remove the
battery
earth
cable.
2.
Remove the wiring plug from
the B+ terminal of the alternator and
fit the test connector.
3. Insert an ammeter between the
alternator B+ terminal and the B+
terminal of the disconnected wiring
cable.
4.
Connect the positive lead of a
voltmeter to the test connector on
the alternator B+ terminal and the
negative lead to ground
.
5.
Replace the battery earth cable.
6.
Install a tachometer on the
engine.
7.
Start the engine, switch on
lights and accessories as necessary
to obtain a charge rate of 10 amps
and adjust the engine speed to 700
R.P.M.
8. Run the engine at this load
and speed for 15 minutes to normal-
ise operating temperature.
9. Cycle the system by stopping
and re-starting the
engine.
10. With the ammeter reading 10
amps the voltmeter reading should
be within 13.5-14.4 volts.
To check the regulating range proceed
as follows :-
11. Increase the engine speed to
2700
-
2800
R.P.M.
The voltage reading with an 8
-
10
amps load should not vary from the
regulating voltage by more .than
-
0.2
to +0.4
volts.
Electrical adjustments
1. Switch off the
engine.
2. Remove the wiring plug from
the base of the regulator.
3. Remove the regulator from the
vehicle.
4.
Remove the sealing tape and
remove the regulator cover.
5.
Refit
the regulator to the
vehicle.
6.
Replace the wiring plug to the
base of the regulator.
7.
Adjust
the
bi-metal spring
bracket upwards to increase or down-
wards to decrease the voltage
setting.
Fig. 26.
8.
Replace the regulator cover,
start the engine and run it at 700
R.P.M. for
5
minutes to stabilize
the temperature.
9. Cycle the system by stopping
and restarting the
engine.
10. With the engine running at 700
R.P.M.
adjust the load (lights etc.)
to 10
amps.
The voltmeter should
read
13.5-
14.4 volts
.
If the specified voltage cannot be
obtained the regulator must be re-
RE ST
POSITION
ATTRACTED
POSITION
BIMETAL SPRING
"
ARMATURE TIP
-~
L
BIMETAL SPRi
riG
BRACKET
~
~
•
-
t
B
~
II
~p
l D
LOWER
UPPER
~~
.
t---l
FIG. 32 - Bosch Regulator Gap Setting
,.._A
CONTACT BRACKET
CONTACT BRACKET
~
..........,
D
~~
II"'
1\
-
--""
.........::~
-
\
c
~I
....--..,
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