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 647 of 1275
TM9-2350-311-20-1
CONTEN S
T
PAGE
8-37
8-38
8-39
8-40
Section Ill
8-41
8-42
8-43
8-44
8-45
8-46
8-47
8-48
8-49
8-50
8-51
8-52
8-53
8-54
8-55
8-56
8-57
8-58
8-59
8-60
8-61
8-62
8-63
Section IV
8-64
8-65
8-66
8-67
8-68
8-69
8-70
8-71
8-72
8-73
8-74
8-75
8-76
8-77
8-78
8-79
8-80
8-81
8-82
8-83
8-84
8-2
HEADLIGHT DIMMER AND STOP LIGHT SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
8-93
SLAVE START RECEPTACLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-95
EXTERNAL POWER RECEPTACLE (M109A4/M109A5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-96
COMBAT OVERRIDE SWITCH ASSEMBLY (M109A4/M109A5). . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-98
POWERPLANT AND HULL WIRING HARNESSES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 8-100
CIRCUIT ID AND ILLUSTRATION OF ELECTRICAL WIRING HARNESSES (M109A2/M109A3) .
. 8-100
CIRCUIT ID AND ILLUSTRATION OF ELECTRICAL WIRING HARNESSES (M109A4/M109A5) .
. 8-102
POWERPLANT WIRING HARNESS (M109A/M109A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-104
POWERPLANT WIRING HARNESS (M109A4/M109A5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-108
ENGINE DISCONNECT BRACKET-TO-BULKHEAD WIRING HARNESS (M109A/M109A3) . . .
.. 8-114
DRIVER’S BULKHEAD-TO-MASTER RELAY WIRING HARNESS (M109A4/M109A5) . . . . . . . .
.. 8-116
BULKHEAD-TO-HEADLIGHT/BILGE PUMP WIRING HARNESS . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-118
HEADLIGHT WIRING HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-121
BULKHEAD-TO-PORTABLE INSTRUMENT PANEL WIRING HARNESS. . . . . . . . . . . . . . . . . . .
.. 8-122
BULKHEAD-TO-DRIVER’S INSTRUMENT PANEL WIRING HARNESS . . . . . . . . . . . . . . . . . . . . .
. 8-125
DRIVER’S INSTRUMENT PANEL WIRING HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-128
ACCESSORY CONTROL BOX-TO-HEATER/BLOWER WIRING HARNESS . . . . . . . . . . . . . . . .
.. 8-132
ACCESSORY CONTROL BOX WIRING HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 8-136
POWER LEAD WIRING HARNESS (M109A2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-137
POWER LEAD (M109A2/M109A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-139
POWER LEAD (M109A4/M109A5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-141
PORTABLE INSTRUMENT PANEL WIRING HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-143
lNTERCOM/TELEPHONE WIRING HARNESS AND SLIP RING TELEPHONE
FEED WIRING HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-148
RECTIFIER-TO-VOLTAGE REGULATOR WIRING HARNESS (M109A2/M109A3) . . . . . . . . . . .
.. 8-154
RECTIFIER-TO-VOLTAGE REGULATOR WIRING HARNESS (M109A4/M109A5) . . . . . . . . . . .
.. 8-156
DIODE WIRING HARNESS (M109A4/M109A5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-158
VENTILATED FACE PIECE SYSTEM POWER WIRING HARNESS (M109A4/M109A5) . . . . . . . .
. 8-160
NATO SLAVE START-TO-EXTERNAL POWER WIRING HARNESS (M109A4/M109A5) . . . . . .
.. 8-163
POWERPLANT AND HULL ELECTRICAL LEADS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-166
ACCESSORY CONTROL BOX INDICATOR LIGHT GROUND LEAD. . . . . . . . . . . . . . . . . . . . . . .
. 8-166
ACCESSORY CONTROL BOX HEAT SELECTOR SWITCH-TO-CIRCUIT BREAKER LEAD . . .
.. 8-168
ACCESSORY CONTROL BOX VENTILATOR BLOWER SWITCH-TO-CIRCUIT BREAKER
LEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-169
ACCESSORY CONTRL BOX VENTILATOR BLOWER SWITCH LEAD . . . . . . . . . . . . . . . . . . . .
.. 8-171
ACCESSORY CONTROL BOX POWER LEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-173
LOW COOLANT INDICATOR LIGHT ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-175
FLAME HEATER SWITCH LEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-177
CIRCUIT BREAKER TO "Y” CONNECTOR LEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-178
AIR CLEANER BLOWER LEAD ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-180
IN-TANK FUEL PUMP LEAD ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-182
FUEL PUMP CIRCUIT BREAKER LEAD ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 8-184
FUEL PUMP SWITCH-TO-CIRCUIT BREAKER LEAD ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-185
CIRCUIT BREAKER-TO-”Y” CONNECTOR LEAD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-186
GLOW PLUG WAIT LIGHT-TO-BULKHEAD TO PORTABLE INSTRUMENT PANEL WIRING
HARNESS LEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-188
MASTER WARNING LIGHT ASSEMBLY (STEERING SHAFT). . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-189
PARKING BRAKE LIGHT SWITCH ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-191
BATTERY TERMINAL CONNECTOR AND GROUND CABLES . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-193
ENGINE BRACKET-TO-DRIVER'S BULKHEAD LEAD ASSEMBLY (M109A/M109A3) . . . . . . .
.. 8-194
MASTER RELAY-TO-DRIVER'S BULKHEAD LEAD ASSEMBLY (M109A4/M109A5) . . . . . . . . .
.. 8-196
ENGINE ELECTRICAL GROUND LEAD (M109A4/M109A5). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-198
STARTER-TO-ENGINE ELECTRICAL DISCONNECT (M109A4/M109A5) . . . . . . . . . . . . . . . . . .
.. 8-199
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