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
2.
Use digital multimeter to measure
Resistance Less Than 5.0 Ohms -
Lights Do Not Operate
resistance between rear chassis
Replace backup alarm relay (WP
and/or Backup Alarm
wiring harness connector FA-C33
0009, Figure 141).
Does Not Operate - Con-
(WP 0009, Figure 142) terminal 4
Remove jumper wire between FA-C29
tinued
and machine ground. Resistance
(WP 0009, Figure 310) terminals 2
should be less than 5.0 ohms.
and 1.
Connect the rear lamps harness con-
nector AG-C20 (WP 0009, Figure 311)
to rear chassis wiring harness con-
nector FA-C29 (WP 0009, Figure 310)
(WP 0178).
Connect the backup alarm harness
connector FC-C1 (WP 0009, Figure
361) to rear chassis wiring harness
connector FA-C11 (WP 0009, Figure
362) (WP 0188).
Proceed to step 3.
Resistance 5.0 Ohms or Greater -
Replace rear chassis wiring harness
(WP 0188).
Proceed to step 3.
3. 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 6. Check for Faulty Cab
Lower Wiring Harness.
1. Turn battery disconnect switch
and ignition switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect the control indicator
harness connector PE-C11 (WP
0009, Figure 287) from cab lower
wiring harness connector P-C11
(WP 0009, Figure 286) (WP
0283).
3. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
0023-121