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 456 of 828

TM 9–2350–311–20–2

8–32

8–6

POWER RELAY BOX TO PRESSURE SWITCH WIRING HARNESS — CONTINUED

a.

Removal

NOTE

The power relay box to pressure switch wiring harness is taped into a wiring bundle and is removed

by removing the electrical tape. Replace tape as needed during installation.

1

Disconnect female connector (1), wire 645, from power relay box assembly (2).

2

Disconnect connector (3), wire 645, from quick-disconnect near pressure switch (4).

3

Disconnect female connector (5) from pressure switch (4).

4

Remove two cap screws (6), two flat washers (7), two plastic attaching straps (8), and two lockwashers (9)

from power relay box to pressure switch wiring harness and vehicle. Discard lockwashers.

b.

Disassembly/Assembly

See repair procedures for harnesses, plugs and terminals (para 8–1).

c.

Testing

Using multimeter, test power relay box to pressure switch wiring harness for continuity through all plugs and

connectors.

d.

Installation

1

Install two plastic attaching straps (8), two flat washers (7), two new lockwashers (9), and two cap screws

(6) to power relay box to pressure switch wiring harness and to vehicle.

2

Connect female connector (5) to pressure switch (4).

3

Connect connector (3), wire 645, to quick-disconnect near pressure switch (4).

4

Connect female connector (1), wire 645, to power relay box assembly (2).

NOTE

After installation, check to ensure the wiring bundles will not be pinched by commander’s seat.