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 installing left lower rear molding, to prevent damaging air line.
Scrape painted surfaces to bare metal before connecting test leads to ensure correct
Test backup light switch (1) as follows: Disconnect batteries (page 2-424). Set multimeter to ohms scale
and adjust to 0 ohms. Connect red test lead to terminal (2) and black test lead to terminal (3) on backup
light switch (1). Have assistant start engine (TM 5-3805-254-10) and put shift lever (4) in reverse (R)
position. Check for 0 ohms on multimeter. Have assistant put shift lever (4) in neutral (N) position and
shut down engine (TM 5-3805-254-10). Disconnect test leads.
If multimeter reads no continuity, replace backup light switch (1) (page 2-689). Put
air line (5) through hole in left lower rear molding (6) and put molding in place.
Screw in eight screws (7) and eight flat washers (8) using number two cross-tip
screwdriver. Put air line (5) in drivers seat valve assembly (9). Screw on line nut
(10) and tighten using 9/16-inch open-end wrench. Connect batteries (page 2-424).
If multimeter reads 0 ohms, go to step 14.