TM 5-3805-261-23-1
ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES - CONTINUED
0008 00
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
Test continuity of headlight switch in
If multimeter indicates no reading, circuit
19. Blackout Drive Lights Fail to
all blackout drive positions. Connect
does not have continuity. Replace light
Operate - Continued.
one multimeter lead to back of switch
switch assembly (WP 0101 00).
and one lead to ground.
1.
Check dome light bulb.
Replace dome light bulb if burned out
20. Dome Light Will Not Operate
(CCE Machine).
go to Test 2.
2.
Test continuity of dome light switch.
If multimeter indicates no reading, circuit
Connect multimeter to back of
does not have continuity. Replace dome
switch.
light switch (WP 0099 00). If the problem
still exists, go to Test 3.
3.
Test continuity of dimmer register.
If multimeter indicates no reading, circuit
Connect multimeter to back of
does not have continuity. Replace dimmer
resistor.
resistor (WP 0100 00).
1.
Turn service lights on and check
Reset circuit breaker. If the problem still
21. Horn Fails to Operate.
circuit breaker (60A).
exists, go to Test 2.
2.
Check horn fuse (15A).
Replace fuse if blown (WP 0096 00). If
the problem still exists, go to Test 3.
3.
Check horn assembly.
Replace horn assembly if damaged or
defective (WP 0119 00). If the problem
still exists, go to Test 4.
4.
Test continuity of horn switch.
If multimeter indicates no reading, circuit
Connect one multimeter lead to back
does not have continuity. Replace horn
of switch and one to ground.
switch (WP 0120 00). If the problem still
exists, go to Test 5.
5.
Check horn wiring harness.
Repair horn wiring harness if cracked,
broken, or corroded (WP 0021 00).
Replace horn wiring harness as necessary
1.
Turn on service lights and check
22. Backup Alarm Fails to
backup alarm.
Operate with Transmission in
Reverse.
2.
Check main circuit breaker (60A).
Reset circuit breaker. If the problem still
exists, go to Test 3.
3.
Check back-up alarm fuse (15A).
Replace fuse if blown (WP 0096 00). If
the problem still exists, go to Test 4.
4.
Test continuity of backup alarm.
If multimeter indicates no reading, circuit
Connect one multimeter lead to back
does not have continuity. Adjust or
of switch and one to ground.
replace backup alarm switch as necessary
go to Test 5.
