TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
23. BOTH HEADLIGHTS 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.
NOTE
Scrape painted surfaces to bare metal before connecting test leads to ensure correct multimeter
readings.
Step 19.
Test 50 wire (1) as follows: Disconnect batteries (page 2-424). Pull wire connector (2) off LIGHTS
switch (3). Set multimeter to ohms scale and adjust to 0 ohms. Connect red test lead to wire
connector (2) on 50 wire (1) and black test lead circuit breaker terminal (4). Check for 0 ohms on
multimeter. Disconnect test leads.
a. If multimeter reads no continuity, 50 wire (1) must be replaced. Notify Direct Support
Maintenance.
b. If multimeter reads 0 ohms, push wire connector (2) on to terminal (5) on LIGHTS
switch (3). Install instrument panel pad (page 2-424). Connect batteries (page 2-424).
Go to step 20.
Step 20.
Set multimeter to 20 vdc scale. Connect red test lead to wire connector (6) on LIGHTS switch (3)
and black test lead to ground. Push LIGHTS switch handle (7) up to on position. Check for 11 to
13 vdc on multimeter. Push LIGHTS switch handle (7) down to off position. Disconnect test
leads.
a. If multimeter does not read 11 to 13 vdc, replace LIGHTS switch (3) (page 2-725).
b. If multimeter reads 11 to 13 vdc, go to step 21.
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