TM 9-2320-273-20
Table 5-14. Miscellaneous Electrical Circuit Troubleshooting.
INSTRUCTION
INDICATION
YES
NO
REMARKS
1
ELECTRICAL HORN IS INOPERATIVE
1
Check horn for a good Clean and tighten.
Go to
Repair.
ground.
Step 2.
2 Check for voltage at
12 volts dc nominal.
Replace
Go to
horn using multimeter
horn
Step 3.
while pressing horn
(para 5-68).
button.
3 Check for voltage at
12 volts dc nominal.
Check cir-
Go to
terminal 3 (fig. 5-38)
cuit 41
Step 4.
on horn relay while
wiring.
pressing horn button.
4 Check for voltage at
12 volts dc nominal.
Go to
terminal 1 on horn
Step 5.
relay while pressing
horn button.
5 Jumper terminal 2 on
Horn operates.
Go to
Replace
horn relay to ground.
Step 6.
horn relay
(para 5-67).
6 Check horn button
Wiring and ground
Replace
Repair.
switch ground and
okay.
button
wiring to horn relay.
switch
(para 5-67).
Figure 5-38. Electric Horn Circuit
I
I
1
1
TA 074723
5-60
