TM 9-2320-272-24-1
ELECTRICAL TROUBLESHOOTING SYMPTOM INDEX
TROUBLESHOOTlNG
MALFUNCTION
PROCEDURE
MALFUNCTION
NO.
PAGE
ENGINE AND VEHICLE ELECTRICAL SYSTEM
Engine and vehicle electrical system malfunctioning . . . . . . . . . . . . . . . . . . . .
1.
BATTERY SYSTEM
2.
Batteries are hot, electrolyte is boiling, or excessive use of water. . . . . . . . . . .
Specific gravity will not increase to 1.280 under charge . . . . . . . . . . . . . . . . . .
3.
4.
Engine will not crank; some electrical systems inoperative or weak . . . . . . . .
All vehicle electrical systems inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
STARTING SYSTEM
Starter motor inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.
Solenoid operates, starter operates, but engine cranks slowly. . . . . . . . . . . . . .
7.
Starter motor inoperative; no solenoid thump. . . . . . . . . . . . . . . . . . . . . . . . . .
8.
GENERATING SYSTEM
Batteries hot or boiling; correct specific gravity of all cells is 1.280 . . . . . . . . .
9.
Batteries use excessive water. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.
Batteries run down in service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.
No alternator output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.
Alternator output voltage low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.
Alternator adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.
Battery indicator gauge in red position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15.
LIGHTING SYSTEM
Lamps will not light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16.
Headlamp (one side) inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17.
Headlamp (both sides) inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18.
19.
Blackout drive or blackout marker light inoperative. . . . . . . . . . . . . . . . . . . . .
Stoplight inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
Rear lights inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21.
One or more trailer lights inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22.
DIRECTIONAL SIGNAL SYSTEM
Individual lights do not light with directional signal lever in any position. . . .
23.
No lights operate with directional signal control lever in any position . . . . . . .
24.
System operates incorrectly in one or more positions of directional
25.
signal control lever. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ETHER START SYSTEM
Engine cranks but will not start (fuel available) . . . . . . . . . . . . . . . . . . . . . . . .
26.
INDICATOR, GAUGE, AND WARNING SYSTEM
All gauges inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27.
One gauge inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28.
Temperature gauge inoperative (coolant). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29.
30.
Fuel gauge inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery/alternator gauge inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31.
Horn inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32.
33.
Low air pressure warning buzzer will not shut off
(air pressure gauges at normal system pressure). . . . . . . . . . . . . . . . . . . . . . .
Low air pressure warning buzzer will not shut off and
34.
parking brake warning light flashes with hand/parking
brake in any position (air pressure normal). . . . . . . . . . . . . . . . . . . . . . . . . . .
2-93
