TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
21. BOTH BACKUP LIGHTS DO NOT WORK - CONTINUED.
WARNING
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.
CAUTION
Care must be taken when installing left lower rear molding, to prevent damaging air lines.
NOTE
Scrape painted surfaces to bare metal before connecting test leads to ensure correct
multimeter readings.
Steps performed on junction box with 12 terminals.
Step 8.
Disconnect batteries (page 2-424). Pull wire terminal (1) off terminal (2) on stoplight/taillight assembly (3).
Set multimeter to ohms scale and adjust to O ohms. With assistant, connect red test lead to terminal (4)
on junction box (5) and black test lead to wire terminal (1) on blue wire (6). Check for 0 ohms on
multimeter. Disconnect test leads.
If multimeter reads no continuity, blue wire (6) must be replaced. Notify Direct Support
Maintenance.
2-148
