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.
Scrape painted surfaces to bare metal before connecting test leads to ensure correct
Using number one cross-tip screwdriver, unscrew and take out four screws (1) and take off terminal cover
(2). Check blue wire (3) for broken, frayed, or corroded condition.
If blue wire (3) is broken, blue wire (3) must be replaced. Notify Direct Support
If blue wire (3) is frayed, repair (page 2-424).
if blue wire (3) is corroded, pull wire terminal (4) off of terminal (5) on
stoplight/taillight assembly (6). Clean wire terminal (4) and terminal (5) using wire
brush. Place wire terminal (4) in position and push on to terminal (5) on
stoplight/taillight assembly (6).
If blue wire (3) is not broken, frayed, or corroded, go to step 3.
Set multimeter to 20 vdc scale. Connect red test lead to wire terminal (4) and 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 test leads.