TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
42.
BOTH STOP 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.
NOTE
Scrape painted surfaces to bare metal before connecting test leads to ensure correct multimeter
readings.
Step 4.Test stoplight switch (1) as follows: Using multimeter, set to ohms scale and adjust to 0
ohms. Connect red test lead to terminal (2) and black test lead to terminal (3). Push brake pedal
(4) down. Check for 0 ohms on multimeter. Release brake pedal (4). Disconnect test leads.
a.
If multimeter reads no continuity, replace stoplight switch
(1) (page 2-664).
b.
If multimeter reads 0 ohms, go to step 5.
Step 5.Test jumper wire (5) as follows: Using multimeter, set to ohms scale and adjust to 0 ohms.
Connect red test lead to terminal (2) on stoplight switch (1) and black test lead to terminal (6) on
stoplight switch (7). Check for 0 ohms on multimeter. Disconnect test leads.
a.If multimeter reads no continuity, jumper wire (5) must be replaced. Notify Direct
Support Maintenance.
b.
If multimeter reads 0 ohms, go to step 6.
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