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TM 10-3930-669-20
WARNING
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts battery terminal, a
direct short may result in instant heating of tools, damage to equipment, and injury or death to
personnel.
VOLTAGE TEST
(1)
Remove floor plate (Para 15-12).
(2)
Disconnect connector P16 from
horn.
(3)
Set multimeter select switch to
VOLTS DC.
(4)
Connect positive (+) multimeter lead
to connector P16, terminal 1.
(5)
Connect negative (-) multimeter
lead to a known good ground.
(6)
Set MAIN POWER switch to ON
position (TM 10-3930-669-10).
(7)
Set engine switch to ignition position
(TM 10-3930-669-10).
(a)
If there are not 22 to 24 vdc
present, perform Steps (8)
through (11) below and go to
Step 3 of this Fault.
(b)
If there are 22 to 24 vdc present,
perform Steps (8) through (9)
below and go to Step 2 of this
Fault.
(8)
Set engine switch to off position.
(9)
Connect connector P16 to horn.
(10)
Set MAIN POWER switch to OFF
position.
(11)
Install floor plate.
CONTINUITY TEST
(1)
Disconnect connector P16.
(2)
Set multimeter select switch to OHMS.
(3)
Depress horn switch and check
continuity between connector
P16, terminal 2 and a known good
ground.
(a)
If there is no continuity, perform
Steps (4) and (5) below and go to
Step 4 of this Fault.
(b)
If there is continuity, replace horn
(Para 7-45).
(4)
Connect connector P16.
(5)
Install floor plate (Para 15-12).
2-209
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