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4-9
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.
FIELD
JU1
B (D+)
BATTERY VOLTAGE
WITH TEST LAMP OFF
JUMPER ATTACHED.
1.5 TO 3.0 VOLTS.
TEST LAMP ON
VOLTS
+
---
+
---
d d
+
D+
B
A
*
12vdc
TEST LAMP
TOGGLE
SWITCH
BATTERY
AC TAP
(TACH.)
GROUND
EXCITE
INTEGRAL
REGULATOR
POS+
OUTPUT
(B+)
BATTERY
BLACK
RED
STEP TEST POINT
INDICATION
1
2
3
A (B+)
B (REG)
BATTERY
VOLTAGE
*
*
JUMPER NOT ATTACHED
(TO OIL PRESSURE
SWITCH OR
TOGGLE SWITCH )
Figure 4-9. Open Regulator Test
Test No. 3. Alternator Output Test
CONDITIONS: Engine running (after voltmeter is
connected as shown in Figure 4-10).
GROUND
INTEGRAL
REGULATOR
VOLTS
+
---
D+
POS + OUTPUT
13.8 TO 14.8V
AC TAP
(TACH.)
POS+
OUTPUT
(B+)
BATTERY
EXCITE
BLACK
RED
(TO OIL PRESSURE
SWITCH OR
TOGGLE SWITCH)
+
---
d d
+
12vdc
TEST LAMP
TOGGLE
SWITCH
BATTERY
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.)
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