ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
21. BOTH BACKUP LIGHTS DO NOT WORK - CONTINUED.
Although KEY SWITCH must be on and battery ground cable connected to test electrical
circuit voltage, turn off KEY SWITCH and disconnect battery ground cable before doing
resistance tests or replacing parts. This will keep you from getting shocked and prevent
damage to parts and equipment.
Care must be taken when removing left lower rear molding, to prevent damaging air line.
Scrape painted surfaces to bare metal before connecting test leads to ensure correct
Steps performed on junction box with 12 terminals.
Using 9/16-inch open-end wrench, unscrew line nut (1) and take off air line (2). Using number two cross-
tip screwdriver, unscrew and take out eight screws (3) and eight flat washers (4). Push air line (2) through
hole while taking out left lower rear molding (5). Set multimeter to 20 vdc scale. Connect red test lead to
junction box terminal (6) and connect black test lead to ground. Have assistant start engine (TM 5-3805-
254-10) and put shift lever (7) in reverse (R) position. Check for 11 to 13 vdc on multimeter. Have
assistant put shift lever (7) in neutral (N) position and shut down engine (TM 5-3805-254-10). Disconnect
If multimeter does not read 11 to 13 vdc, put terminal cover (8) on stoplight/taillight
assembly (9). Screw in four screws (10) and tighten, using number one cross-tip
screwdriver and go to step 9.
If multimeter reads 11 to 13 vdc, go to step 8.