Table 1. Backup Light Circuits Troubleshooting Procedures.

TM 9-2320-303-24-1

Table 1. Backup Light Circuits Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Neither Backup Light Operates.

1. Check backup light 15A fuse.

If defective, replace 15A fuse (WP

2. Inspect light bulbs.

Replace if broken or defective

3. Disconnect lead 420JD from If +12 VDC is present, go to step

backup light 15A fuse. Check 4. If no voltage is present, repair

for +12 VDC at lead 420JD.

lead 420JD.

4. Disconnect lead 120 from If +12 VDC is present, go to step

backup light switch. Check for 5. If no voltage is present, repair

+12 VDC at lead 120.

lead 120.

5. Disconnect lead 120B from

If continuity is indicated, go to

backup light switch. Press

step 6. If no continuity is

backup light switch. Check for

indicated, replace backup light

continuity between switch

switch.

contacts.

6. Disconnect lead 120B from If +12 VDC is present, go to step

chassis harness. Check for +12 7. If no voltage is present, repair

VDC at lead 120B.

lead 120B between chassis and

backup light switch.

7. Check for +12 VDC at backup If +12 VDC is present, repair

receptacle

socket

120B receptacle socket ground leads to

connector.

ground. If no voltage is present,

repair lead 120B to chassis wiring

harness.