TM-9-2350-311-20-2

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

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 201 of 828

TM 9–2350–311–20–2

Change 2

3–89

h.

CAB LIGHTING SYSTEM

— CONTINUED

(1)

ONE OR MORE DOME LIGHTS ARE OUT,

BUT SIGHTING EQUIPMENT LIGHTS OPER-

ATE.

INITIAL SETUP

Test Equipment

Multimeter (item 6, Appx H)

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Equipment Condition

Vehicle MASTER switch to ON (TM 9–2350–311–10)

Dome light assembly switch to position A

(TM 9–2350–311–10)

Repair or replace wire 138

from connector to failed

dome light assembly (para

8–3).

yes

no

A

yes

no

Move dome light assembly switch to positions

B and C.

Does only one light come on?

Go to step C.

B

WIRE 138

DOME LIGHT

ASSEMBLY

+–

1.

Turn MASTER switch to OFF.

2.

Disconnect wire 138 at failed dome light

assembly.

3.

Turn MASTER switch to ON.

4.

Place red multimeter lead in wire 138 and black

lead to ground.

5.

Check for voltage.

Is battery voltage present?

CONTINUED ON NEXT PAGE