TM-9-2320-285-24-1
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-1 - Page 191 of 987
TM 9-2320-285-24-1
2-16.
TROUBLESHOOTING SYMPTOM INDEX
NOTE
An electrical system wiring schematic is located at the back of this manual in appendix E.
Para/Malfunction
Page
CHARGING SYSTEM
Alternator overcharging.
...................................................................................
2-17/1
2-169
Alternator undercharging .
................................................................................
2-17/2
2-169
STARTING SYSTEM
Engine will not start .
........................................................................................
2-18/1
2-169
Starter cranks continuously .
............................................................................
2-18/2
2-171
INSTRUMENT PANEL
WATER LEVEL warning light and bell not operating
properly.
....................................................................................................
2-19/1
2-172
WATER TEMP warning light or bell not operating
properly.
....................................................................................................
2-19/2
2-173
OIL PRESSURE warning light or bell not operating
properly.
....................................................................................................
2-19/3
2-174
LOW AIR warning light and buzzer not operating properly .
.............................
2-19/4
2-175
LOW FUEL INDICATOR lamp does not light when fuel tank is
empty.
...............................................................................................................
2-19/5
2-176
LOW FUEL INDICATOR lamp lights when fuel tank is full .
.............................
2-19/6
2-177
Voltmeter inoperative .
.....................................................................................
2-19/7
2-177
Ammeter inoperative .
......................................................................................
2-19/8
2-177
Dash lights and gage lights inoperative .
..........................................................
2-19/9
2-178
Engine stop switch doesn’t stop engine .
.........................................................
2-19/10
2-180
LIGHT SYSTEMS
Trailer lights inoperative (12-volt trailer) .
.........................................................
2-20/1
2-180
Trailer lights inoperative (24-volt trailer) .
.........................................................
2-20/2
2-182
Turn signal lights inoperative .
..........................................................................
2-20/3
2-184
Headlights inoperative .
....................................................................................
2-20/4
2-185
Marker lights and tail lights inoperative .
..........................................................
2-20/5
2-186
SENDING UNITS
WATER TEMP warning light and bell not operating
properly.
....................................................................................................
2-21/1
2-188
OIL PRESSURE warning light and bell not operating
properly.
....................................................................................................
2-21/2
2-188
LOW FUEL INDICATOR light and FUEL gage not operating
properly.
....................................................................................................
2-21/3
2-189
Vehicle stop lights won’t operate.
.....................................................................
2-21/4
2-189
Trailer stop lights won’t operate.
.......................................................................
2-21/5
2-189
HORN SYSTEM
Electric horn does not sound.
...........................................................................
2-22/1
2-190
BATTERY SYSTEM
Batteries require frequent filling.
.......................................................................
2-23/1
2-191
Batteries fail to maintain charge.
......................................................................
2-23/2
2-192
2-168
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