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relay GO2430-04. The normally closed contacts of the warning light relay give a ground to the
GEN warning light GO2430-01. The GEN warning light comes ON.
The voltmeter VM2430-01 shows the voltage on the main bus. It usually shows 14 volts when
the generator is on-line. It shows the battery voltage when the generator is off-line. The
voltmeter may show less than 14 volts during high electrical loads and low engine RPM. This
shows that the battery is helping the generator.
The ammeter AM2430-01 shows the current flowing between the battery and the main bus.
When the ammeter needle shows +, the battery is receiving a charge. When the ammeter
needle shows -, the battery is supplying current.
Electrical Power
DA20-C1 AMM
Page 6
19 Dec 1997 24-30-00 Doc # DA201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 101
19 Dec 1997
TROUBLE-SHOOTING
1. General
Use these flow charts to trouble-shoot the DC electrical generation system
Remove cowling
Check generator belt
Broken\Loose? Yes Replace\Repair
Ref. MM 24-30
No
Disconnect the 2 pin
connector from the
generator.
Is
battery voltage
present on
contact IG
Yes
Replace Generator
Ref. MM 24-30.
No
Run engine. Select Gen. master
to on. Turn engine off. Leave
Batt / Gen Master Switch on.
CAUTION
Open starter circuit breaker.
Select the Gen Master
switch to off and the back
to on
To sheet #2
FAULT: Unable to bring
g e n e r a t o r o n l i n e .
Generator warning light
illuminated. Refer to chapter
92 Dwg. 22-2400-99-00
S h e e t 1 - 1 f o r w i r i n g
schematic. Refer to MM 24-
00 Fig. 2 for component
location
CAUTION
Only those familiar with
saf e ty p ract i ces whi le
working on live electrical
circuits should do so. Injury
or damage to equipment
may result otherwise.
Flow Chart Sheet 1
Electrical Power
DA20-C1 AMM
Page 102
19 Dec 1997 24-30-00 Doc # DA201-C1
Rev. 0
Is battery
voltage across the coil of
relay OV2430-01?
Yes
Replace relay
OV2430-01
Ref MM 24-30
From sheet #1
No
Is battery voltage
being switched through
the gen side of master
sw GC2430-02?
Yes
Replace overvoltage
sensor
Ref MM 24-30
No
Is
battery voltage on
the load side of Generator
control circuit
breaker
Yes Repair wiring between
breaker and master switch.
No
Replace generator control
circuit breaker
Ref MM 24-60
Is battery
voltage present on
contact IG
Yes
Replace generator
Test over voltage Ref. MM 24-30
sensor Ref. MM 24-
30 . Is sensor Ok?
Yes
Replace overvoltage
sensor
Ref MM 24-30
No
No
Flow Chart Sheet 2
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 103
19 Dec 1997
Select battery master
only to on. Ensure the
Oil Press circuit
breaker is closed.
Press to test the
Gen/Warning Light
lens cap.
Does
the Gen warning
No light illuminate? Yes
Is
the bulb seated
improperly or burned
out?
Is there
continuity through
the normally closed
contacts of relay
Reseat bulb or replace GO2430-04?
if necessary
Yes
No
Is
battery voltage
present on the (+)
terminal of the
light assy?
Yes
Replace the Gen
annunciator assy.
No
Is battery
voltage present on
the load side of the Oil
Press circuit
breaker
Repair the wiring between
the circuit breaker
and the annunciator
Yes
No
Replace the circuit breaker
Ref MM 24-60
No
Replace Gen warning
relay GO2430-04 Ref.
MM 24-30 Pg 14
Yes
Check wire
#24313A20N for
continuity to ground.
Ok?
Repair wire
#24313A20N between
relay coil and ground.
Repair Wire #24303A20
between relay and (-) terminal
of light assy.
No
Yes
Fault: Gen warning light
inoperative with battery master
on only. Warning light and
generator operate normally
with Gen master switch on.
Refer to chapter 92 Dwg.22-
2400-99-00 Sheet 1-1 for
wiring schematic. Refer to MM
24-00- Fig. 2 for component
location
A c c ep t ab l e r e s i s t a n c e
measurments for continuity
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