TM 9-2350-256-20-1
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Troubleshooting Procedure
External Vehicle Warning Horn
Symptom
External vehicle warning horn malfunctioning.
Malfunction
External vehicle warning horn fails to operate. Do steps 1 thru 9.
CORRECTIVE ACTION
WARNING
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts a metal surface a direct
short may result in instant heating of tools, damage to equipment, and injury or death to personnel.
1.
Remove three screws (1), three lockwashers (2), ground lead (3), and flat washer (4), and release main
switch panel (5) from mounting brackets. Disconnect switch panel to gage panel and miscellaneous
switches wiring harness from main switch panel. Place red lead of multimeter on pin N of wire 10 and
black lead to ground. Turn MASTER switch on and check for voltage. Turn MASTER switch OFF. If
voltage is present, go to step 3. If voltage is not present, go to step 2.
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