TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

  TM-9-2350-311-20-1 - Page 289 of 1275

TM 9-2350-311-20-1
CONTINUED FROM STEP G
3.
4.
5.
6.
Reconnect lead 27 to circuit breaker output.
Disconnect bulkhead-to-portable instrument
panel wiring harness from portable
instrument panel bracket.
Place a jumper wire from socket P (lead
459B) to socket C (Iead 459).
Place red lead of multimeter in socket A
(lead 27) and black lead to ground.
Turn MASTER switch ON and check for
voltage.
Turn MASTER switch OFF.
Is voltage present?
Repair or replace lead 27 of
bulkhead-
to-portable instrument panel wiring
harness (para 8-49).
Repair or replace lead 27 of portable
instrument panel wiring harness (para 8-57).
CONTINUED FROM STEP G
1. Reconnect lead 27 to circuit breaker output.
2. Disconnect lead 10 from circuit breaker
input.
3. Place red lead of multimeter in lead 10
and black lead to ground.
4. Turn MASTER switch ON and check for
voltage.
5. Turn MASTER switch OFF.
Is voltage present?
I
I
I
I
Troubleshoot master relay circuit
I
I
(par 3-3b).
Replace circuit breaker (para 8-33,
M109A2/M109A3; 8-34, M109A4/M109A5).
END OF TASK
3-189
1.
2 .


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