TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
42.
BOTH STOPLIGHTS 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.
Start engine and check that air pressure in air system is between 90 and 130 psi (TM 5-3805-254-
10). Shut down engine (TM 5-3805-254-10).
Step 7.Using multimeter set to 20 vdc scale. Connect red test lead to wire terminal (1) on wire
connector (2) and black test lead to ground. Push brake pedal (3) down. Check for 11 to 13 vdc
on multimeter. Release brake pedal (3). Disconnect test leads.
a.If multimeter does not read 11 to 13 vdc, 70A wire (4) must be replaced. Notify
Direct Support Maintenance.
b.
If multimeter reads 11 to 13 vdc, go to step 8.
Step 8.Test turn signal switch (5) as follows: Pull apart wire connectors (2 and 6). Using
multimeter set to ohms scale and adjust to 0 ohms. Connect red test lead to wire terminal (1) and
black test lead to wire terminal (7) on wire connector (2). Check for 0 ohms on multimeter. Move
black test lead to wire terminal (8). Check for 0 ohms on multimeter. Disconnect test leads.
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