BOLETÍN OFICIAL DEL ESTADO
MÓDULO FORMATIVO 4
yes no
Repair or replace harness W124 (para 8–82).
Replace circuit breaker no. 6 (CB6) (para 8–20).
Repair or replace harness W115 (para 8–74).
END OF TASK
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Reconnect lead 37 to auxiliary outlet connector. 3. Disconnect harness W124 lead 10 from circuit
breaker no. 6 (CB6).
4. Place multimeter red lead in lead 10 connector socket and black lead to ground.
5. Turn vehicle MASTER switch ON
(TM 9–2350–314–10) and check for voltage.
C
Is voltage present? BLACK LEAD RED LEAD CIRCUIT BREAKER NO. 6 BLACK LEAD CONNECTS TO HARNESS W115 LEAD 37/38 W124 LEAD 10 W124 LEAD 10 RED LEAD 3–33/(3–34 blank)The bilge pump is used to evacuate water from the engine compartment, usually after fording. The bilge pump is not to be run for more than one minute in a dry compartment or fifteen minutes in a wet compartment unless the engine is running.
The bilge pump system consists of the bilge pump, bilge pump relay, bilge pump circuit breaker, circuit breaker number 2 (CB2), and related electrical wiring.
To operate the bilge pump, the vehicle MASTER switch must be ON. By turning on the vehicle MASTER switch, power from the batteries travels through the MASTER relay to circuit breaker 2 (CB2). From circuit breaker 2 (CB2), the power travels to the bilge pump switch. Once the bilge pump switch is turned on, the power travels through the bilge pump circuit breaker to the bilge pump relay. The bilge pump relay sends the power to the bilge pump and the bilge pump is energized.
3–36
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Disconnect harness W113 connector P3 from bilge pump relay.
3. Place multimeter red lead in harness W113 connector P3 socket C and black lead on ground.
4. Turn vehicle MASTER switch ON
(TM 9–2350–314–10) and check for voltage. Is voltage present?
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Disconnect harness W113 lead 452 from bilge pump connector.
3. Place multimeter red lead on harness W113 lead 452 connector socket and black lead on ground.
4. Turn vehicle MASTER and BILGE PUMP switches ON (TM 9–2350–314–10) and check for voltage.
Is voltage present?
Replace bilge pump (para 18–5). INITIAL SETUP
Tools Equipment Conditions
General mechanic’s tool kit Powerpack removed
(SC 5180–90–N26) (para 4–1)
Multimeter (item 38, Appx F)
Probe kit (item 35, Appx F) Personnel Required Two
A
c. BILGE PUMP – CONTINUED (1) BILGE PUMP FAILS TO OPERATE. Other electrical components operate.
B
yes no
yes no
Go to step E. CONTINUED ON NEXT PAGE
NOTE
It may be necessary to remove the bilge pump relay from its mounting bracket to make it easier to disconnect and reconnect harness.
W113 CONNECTOR LEAD 452 RED LEAD BLACK LEAD RED LEAD W113 CONNECTOR P3 SOCKET C BLACK LEAD BILGE PUMP RELAY W113 CONNECTOR P3
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Disconnect harness W105 lead 452A from bilge pump circuit breaker.
3. Place multimeter red lead on harness W105 lead 452A and black lead on ground. Is continuity present?
Is voltage present?
1. Turn BILGE PUMP switch ON (TM 9–2350–314–10).
2. Place multimeter red lead in harness W113 connector P3 socket A and black lead on ground and check for voltage.
1. Turn vehicle MASTER and BILGE PUMP switches OFF (TM 9–2350–314–10).
2. Check continuity of harness W113, by placing one multimeter lead in harness W113
connector lead 452 at bilge pump and other lead in harness W113 connector P3 socket B.
D
c. BILGE PUMP – CONTINUED
CONTINUED FROM STEP B
(1) BILGE PUMP FAILS TO OPERATE. Other electrical components operate. – CONTINUED
no yes
Repair or replace harness W113 (para 8–72).
no yes
Go to step G.
C
Replace bilge pump relay (para 8–23).
E
CONTINUED FROM STEP B
W113 CONNECTOR LEAD 452 RED LEAD W113 CONNECTOR P3 SOCKET A RED LEAD W113 CONNECTOR P3 SOCKET B W105 LEAD 452A BILGE PUMP 50 AMP C/B BLACK LEAD
3–38
Is voltage present?
Repair or replace harness W105 (para 8–64).
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Reconnect harness W105 lead 452A to bilge pump circuit breaker connector.
3. Disconnect harness W113 lead 452B from bilge pump circuit breaker connector. 4. Place multimeter red lead on circuit breaker
connector terminal and black lead to ground. 5. Turn vehicle MASTER switch ON
(TM 9–2350–314–10) and check for voltage.
F
CONTINUED FROM STEP E
no yes
Replace bilge pump circuit breaker (para 8–23).
no yes
CONTINUED ON NEXT PAGE
c. BILGE PUMP – CONTINUED (1) BILGE PUMP FAILS TO OPERATE. Other electrical components operate. – CONTINUED
Repair or replace harness W113 (para 8–72).
Is voltage present?
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Disconnect harness W124 lead 10 from circuit breaker no. 2.
3. Place multimeter red lead in harness W124 lead 10 connector socket and black lead to ground. 4. Turn vehicle MASTER switch ON
(TM 9–2350–314–10) and check for voltage. CONTINUED FROM STEP C
G
RED LEAD BLACK LEAD BILGE PUMP 50 AMP C/B BLACK LEAD RED LEAD W113 LEAD 452B W124 LEAD 10Is voltage present?
Repair or replace harness W124 (para 8–82).
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Reconnect harness W124 lead 10 to circuit breaker no. 2.
3. Disconnect harness W120 lead 450 from circuit breaker no. 2.
4. Place multimeter red lead on circuit breaker connector pin and black lead on ground. 5. Turn vehicle MASTER switch ON
(TM 9–2350–314–10) and check for voltage.
H
no yes
Replace circuit breaker 2 (para 8–20).
no yes
c. BILGE PUMP – CONTINUED (1) BILGE PUMP FAILS TO OPERATE. Other electrical components operate. – CONTINUED
CONTINUED FROM STEP G
Repair or replace harness W120 1. Turn vehicle MASTER switch OFF
(TM 9–2350–314–10).
2. Reconnect harness W120 lead 450 to circuit breaker no. 2.
3. Disconnect harness W120 lead 450 from bilge pump switch.
4. Place multimeter red lead in harness W120 lead 450 connector socket and black lead to ground. 5. Turn vehicle MASTER switch ON
(TM 9–2350–314–10) and check for voltage.
no yes
I
Is voltage present? BILGE PUMP SWITCH BLACK LEAD RED LEAD W120 LEAD 450 BLACK LEAD RED LEAD CIRCUIT BREAKER NO. 23–40
Is continuity present?
1. Turn vehicle MASTER switch OFF (TM 9–2350–314–10).
2. Disconnect harness W115 lead 450 from bilge pump switch.
3. Turn bilge pump switch ON (TM 9–2350–314–10).
4. Check for continuity across bilge pump switch.
J
CONTINUED FROM STEP I
no yes
Replace bilge pump switch (para 8–12).
c. BILGE PUMP – CONTINUED (1) BILGE PUMP FAILS TO OPERATE. Other electrical components operate. – CONTINUED
Repair or replace harness W115 (para 8–74).
Repair or replace harness W113 (para 8–72).
Is continuity present?
1. Reconnect harness W120 lead 450 to bilge pump switch connector.
2. Disconnect harness W115 connector P1 from harness W113 bulkhead connector J1. 3. Check harness W113 for continuity from
connector P3 socket A to connector J1 pin L.
no yes
K
END OF TASK W113 CONNECTOR P3 SOCKET A CONNECTOR J1W113 PIN L BILGE PUMP SWITCHThe cab power circuit consists of the vehicle batteries, the master relay, vehicle MASTER switch, external power and NATO slave receptacles, circuit breaker number 2 (CB2) , hull slip ring assembly, and related electrical wiring. The diagram below shows the relationship of these components.
When the vehicle MASTER switch is ON, 24 V dc is supplied from the batteries through the master relay to the hull slip ring providing power to the cab. The cab can also receive power from another vehicle by
connecting a slave cable to either the vehicle’s NATO slave or external power receptacles and turning on the other vehicle’s MASTER switch.
3–42
d. CAB POWER – CONTINUED (1) NO POWER TO CAB SEGMENT BOARDS.
INITIAL SETUP Tools
General mechanic’s tool kit (SC 5180–90–N26)
Multimeter (item 38, Appx F)
1. Check the NATO receptacle for voltage by placing multimeter red lead in NATO receptacle socket and black lead on ground.
2. Turn vehicle MASTER switch ON (TM 9–2350–314–10). Go to para 3–3.a(1). Is voltage present?
A
no yesCONTINUED ON NEXT PAGE
NATO RECEPTACLE RED LEAD BLACK LEAD
Go to step H. no
Check at left segment board for voltage by placing multimeter red lead on harness W117 leads 10 terminals (E5–E6) and black lead on harness W116 leads 7 terminals (E5–E6).
yes
CONTINUED FROM STEP A