TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. One or Both Backup
Test Step 2. Check for Faulty Rear
Lights Do Not Operate
Lamps Harness.
and/or Backup Alarm
1. Disconnect the rear lamps har-
Does Not Operate - Con-
ness connector AG-C20 (WP
tinued
0009, Figure 311) from rear chas-
sis wiring harness connector FA-
C29 (WP 0009, Figure 310) (WP
0178).
2. Place transmission control switch
in reverse (R) (TM 5-3805-293-
10).
3. Using digital multimeter, test for
Voltage Between 18 and 26 Volts -
voltage between rear chassis wir-
Replace rear lamps harness (WP
ing harness connector FA-C29
0178).
(WP 0009, Figure 310) terminal 2
Proceed to step 4.
and terminal 1. Voltage should be
Voltage Less Than 18 Volts - Pro-
18 to 26 volts.
ceed to Test Step 3.
4. Turn battery disconnect switch,
One or Both Backup Lights and/or
and ignition switch to the ON posi-
Backup Alarm Do Not Operate -
tion. Place control indicator switch
Repeat troubleshooting from the
to position SER. DRIVE. Place
beginning.
the transmission control switch in
Both Backup Lights and Backup
R (TM 5-3805-293-10).
Alarm Operate - Troubleshooting
complete.
Test Step 3. Check for Faulty
Backup Alarm Relay.
1. Disconnect the backup alarm
relay (WP 0009, Figure 141) from
rear chassis wiring harness con-
nector FA-C33 (WP 0009, Figure
142) (WP 0188).
2. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
3. Place transmission control switch
in reverse (R) (TM 5-3805-293-
10).
4. Using digital multimeter, test for
Voltage Between 18 and 26 Volts -
voltage between connector FA-
Proceed to Test Step 4.
C33 (WP 0009, Figure 142) termi-
Voltage Less Than 18 Volts - Pro-
nal 1 and machine ground. Volt-
ceed to Test Step 6.
age should be 18 to 26 volts.
0023-119
