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Test No. 2 --- Open Regulator Test
CONDITIONS: Engine stopped (start-run-stop
switch in the RUN position) and voltmeter set-up as
shown in Figure 4-9.
NOTE
Before performing test, removal of back cover is
required. To remove, disconnect wires from
terminals extending through back cover.
Remove back cover (two screws) and reconnect
all wires.
a. With jumper not attached, check for battery voltage
at terminals A and B. Test lamp will be off.
b. Add jumper JU1 between field and ground (see
Figure 4-9). If 1.5 to 3.0 volts is present at terminal B and
the test lamp is on, the regulator is open. Alternator
should be removed for repair.
TOGGLE
SWITCH
+
d d
BATTERY
AC TAP
(TACH.)
D+
B
GROUND
INTEGRAL
REGULATOR
EXCITE
(TO OIL PRESSURE
SWITCH OR
TOGGLE SWITCH )
FIELD
VOLTS
BLACK
+
---
STEP
TEST POINT
*
1
A (B+)
*
2
B (REG)
3
B (D+)
RED
*
JUMPER NOT ATTACHED
Figure 4-9. Open Regulator Test
12vdc
TEST LAMP
A
POS+
OUTPUT
(B+)
JU1
+
---
BATTERY
INDICATION
BATTERY
VOLTAGE
BATTERY VOLTAGE
WITH TEST LAMP OFF
JUMPER ATTACHED.
1.5 TO 3.0 VOLTS.
TEST LAMP ON
4-9
Test No. 3. Alternator Output Test
CONDITIONS: Engine running (after voltmeter is
connected as shown in Figure 4-10).
TOGGLE
SWITCH
+
d d
BATTERY
AC TAP
(TACH.)
D+
GROUND
EXCITE
(TO OIL PRESSURE
SWITCH OR
TOGGLE SWITCH)
VOLTS
BLACK
+
---
RED
POS + OUTPUT
13.8 TO 14.8V
Figure 4-10. Alternator Output Test
a. Start unit and run engine with load. With the unit
operating (placing a load on charging circuit) check for
nominal system output voltage of between 13.8-14.8 volts
for a properly operating charging system. (Voltages may
vary a few tenths of a volt, higher or lower, due to ambient
temperature variations.)
b. If the alternator output voltage does not fall within
the proper range, the alternator should be removed for
further inspection and tests. (See Table 1-3 and refer to
Prestolite manual.)
12vdc
TEST LAMP
POS+
OUTPUT
(B+)
+
---
BATTERY
INTEGRAL
REGULATOR
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