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Page Title:
HORN DOES NOT OPERATE - continued |
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 TM 10-3930-673-20-1
2. HORN DOES NOT OPERATE (CONT).
4
KNOWN INFO
TEST OPTIONS
Horn OK.
Voltage test.
Is 24 vdc present at circuit
Wire 22 OK.
STE/ICE-R #89.
breaker CB10 where wire 20
Horn switch OK.
REASON FOR QUESTION
connects?
POSSIBLE PROBLEMS
If voltage is present, wire 20 faulty.
Wire 20 faulty.
Circuit breaker CB10 faulty.
Wire 29 faulty.
Relay K4 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 5 of this
NO
fault.
YES
Repair wire 20
(Para 8-48).
5
KNOWN INFO
TEST OPTIONS
Horn OK.
Voltage test.
Is 24 vdc present at circuit
Wire 22 OK.
STE/ICE-R #89.
breaker CB10 where wire 29
Horn switch OK.
REASON FOR QUESTION
connects?
Wire 20 OK.
If voltage is present, circuit breaker
POSSIBLE PROBLEMS
CB10 faulty.
Circuit breaker CB10 faulty.
Wire 29 faulty.
Relay K4 faulty.
Wire 1 faulty.
Circuit breaker CB6 faulty.
Wire 9 faulty.
Connector J2 faulty.
Connector P2 faulty.
Go to Step 6 of this
NO
fault.
YES
Replace circuit
breaker CB10
(Para 8-11).
2-50
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