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Page Title:
BOTH WARNING LIGHTS DO NOT WORK |
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 TM 5-2420-222-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
17. BOTH WARNING LIGHTS DO NOT WORK
WARNING
Although ignition lock switch must be on and battery ground cable connected to test electrical circuit
voltage, turn off ignition lock 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.
Step 1.
Test turn signal switch in-line fuse (page 2-602).
a.
If fuse passes test or is not present, go to step 2.
b.
If fuse fails test, replace turn signal switch in-line fuse (page 2-602).
Step 2.
Turn on emergency flashers (TM 5242022210). Using multimeter set to 30 vdc scale, place red probe
on blue wire terminal (1) and black probe on cowl support (2). Check for 11 to 13 vdc on multimeter.
a.
If multimeter reads 11 to 13 vdc, turn off emergency flashers (TM 5-2420-222-10) and
replace turn signal switch (page 2-594).
b.
If multimeter reads less than 11 vdc, go to step 3.
Step 3.
Using multimeter set to 30 vdc scale, place red probe on black wire terminal (3) and black probe on
cowl support (2). Check for 11 to 13 vdc on multimeter. Turn off emergency flashers (TM 5-2420-
222-10).
a.
If multimeter reads 11 to 13 vdc, replace warning light flasher (page 2-657).
b.
If multimeter reads less than 11 vdc, repair black wire (page 2-137).
18. ONE TURN SIGNAL DOES NOT WORK
Check turn signal operation to see which light or lights do not work (TM 5-2420-222-10).
2-82
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