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
4.
Use a digital multimeter, test for
Voltage Between 18 and 26 Volts -
Lights Do Not Operate
voltage between connector P-C11
Proceed to Test Step 8.
and/or Backup Alarm
(WP 0009, Figure 286) terminals
Voltage Less Than 18 Volts - Pro-
Does Not Operate - Con-
1 and machine ground. Voltage
ceed to Test Step 7
tinued
should be 18 to 26 volts.
Test Step 7. Check for Bad Fuse.
1. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
2. Remove fuse F38 from cab fuse
panel (TM 5-3805-293-10).
3. Visually inspect fuse F38 for open
Resistance Less Than 5.0 Ohms -
or use a digital multimeter to mea-
Replace cab lower wiring harness
sure resistance between the ter-
(WP 0266).
minals of fuse F38. Resistance
Connect the backup alarm relay (WP
should be less than 5.0 ohms.
0009, Figure 141) to rear chassis wir-
ing harness connector FA-C33 (WP
0009, Figure 142) (WP 0188).
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).
Install fuse F38 to cab fuse panel
(TM 5-3805-293-10).
Proceed to step 4.
Fuse Open or Resistance 5.0 Ohms
or Greater - Replace fuse F38.
Connect the control indicator harness
connector PE-C11 (WP 0009, Figure
287) to cab lower wiring harness con-
nector P-C11 (WP 0009, Figure 286)
(WP 0283).
Connect the backup alarm relay (WP
0009, Figure 141) to rear chassis wir-
ing harness connector FA-C33 (WP
0009, Figure 142) (WP 0188).
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).
Proceed to step 4.
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