TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM
20. ALL LIGHTS DO NOT WORK.
WARNING
Do not smoke, use open flame, or allow sparks near batteries. Mixture of oxygen and
hydrogen gases released from batteries is highly flammable and can explode causing
serious injury or death.
Although key switch must be on and negative battery cable connected to test electrical
circuit voltage, turn off key switch and disconnect negative battery cable before doing
resistance tests or replacing parts. This will keep you from getting shocked and prevent
damage to parts and equipment.
NOTE
Scrape painted surfaces to bare metal before connecting test leads to ensure correct
multimeter readings.
Step 1.
Check batteries as follows: Remove battery box cover (page 2-424). Set multimeter to 20 vdc scale.
Connect red test lead to positive terminals (1) or (2) and black test lead to ground. Check for 11 to 13 vdc
on multimeter. Disconnect test leads.
a.
If multimeter does not read 11 to 13 vdc, remove and clean battery cables (page 2-
424).
b.
If multimeter reads 11 to 13 vdc, install battery box cover (page 2-424) and go to
step 2.
2-132
