TM 9-2320-289-20
Table 2-4. Electrical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
8.
9.
10.
“GEN 2“ LIGHT REMAINS ON WITH KEY IN “OFF” POSITION (ALL EXCEPT M1010)
Step 1.
Remove generator 2 relay. (See paragraph 4-9)
If light goes out, replace relay.
If light remains on, trace circuit through brown/red lead to “GEN 2“ light in
instrument panel. (See wiring diagram F-9)
VOLTMETER INOPERATIVE OR IN YELLOW (UNDERCHARGE) ZONE; GENERATOR LIGHTS
OPERATING PROPERLY (ALL EXCEPT M1010)
Step 1.
Check alternator belts for looseness or damage. (See paragraph 4-2)
Step 2.
Check 20 amp ignition fuse and 10 amp/28 v (voltmeter) fuse. (See
paragraph 4-1 2)
Replace fuse if burned out.
Step 3.
Remove voltmeter relay. (See paragraph 4-9) Start engine. Using jumper wire,
connect white lead terminal and black lead terminal.
If voltmeter reads in green zone, replace relay.
If voltmeter does not read in green zone, trace circuit from bus bar ground to
fuse block. (See wiring diagram F-4) If circuit is good, replace voltmeter, (See
paragraph 4-9)
VOLTMETER IN RED (OVERCHARGE) ZONE (ALL EXCEPT M1010)
Step 1.
Start engine. Check voltage at left and right alternators at positive (+) terminals.
Voltage should not exceed 16.0 at left alternator or 31.8 at right alternator.
If voltage is over 16,0 at left alternator or 31.8 at right alternator, replace
alternator. (See paragraph 4-2)
If voltage is correct, replace voltmeter. (See paragraph 4-9)
VOLTMETER REMAINS OPERATIVE WITH KEY IN “OFF” POSITION
Step 1.
Remove voltmeter relay. (See paragraph 4-9)
If voltmeter becomes inoperative, replace relay.
(All except M1010) If voltmeter still operates, trace
relay connector to voltmeter. (See wiring diagram
(M1000) If
brown/red
circuit from white lead at
F-4)
voltmeter Still operares, trace circuit between pink blacK lead and
lead. (See wiring diagram F-6)
2-60
Change 2
