ARMY
TM 5-6115-612-12
MARINE CORPS TM 6115-12/7
AIR FORCE
T0 35C2-3-471-1
4-10. GENERAL. (cont)
NAVY
AG-320B0-0MM-000
Table 4-3.
Organizational Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check for 24 Vdc at end of power cable using voltmeter or by
checking aircraft indicator.
If no voltage present, go to Step 3.
If voltage is present,
place CONTACTOR switch in CLOSED
position and check for 28 Vdc across magnetic output
contactor terminals S4-31 and S4-32.
If voltage is
present,
replace
magnetic
output
contactor (paragraph
4-83c).
If no voltage, check for shorts and continuity in
wires U116A18 (S4-31 to TB3-9) and P105T18 (S4-32 to
TB3-6).
Repair or replace as necessary.
Step 3.
With MASTER SWITCH in OFF position, disconnect connector P6
from EECM.
Connect voltmeter between P6-T and ground. Place
MASTER SWITCH in RUN position and CONTACTOR switch in CLOSED
position.
If 28 Vdc present, go to Step 4.
If no voltage, check continuity in wires U126A18 (P6-T to
S2-3) and P105B14 (CB1-2 to S3-2). Repair or replace as
necessary.
Test/replace CONTACTOR switch (paragraph 4-78).
Step 4.
With generator set running and CONTACTOR switch in CLOSED
position,
measure voltage across
magnetic output contactor
S4-X1 and S4-X2.
If voltage reads 28 Vdc, replace magnetic output contactor
(paragraph 4-83c).
If no voltage,
check for shorts and continuity in wires
U115A18 (S4-X1 to TB3-11) and V102AD18N (S4-X2 to TB3-12).
Repair or replace as necessary.
If good, replace EECM
(paragraph 4-64).
20.
HOURMETER DOES NOT OPERATE.
Step 1.
Ensure that VOLTAGE meter indicates 20-35 Vdc.
If no voltage indicated, go to Malfunction 21.
If voltage present, go to Step 2.
4-41
