TM 5-3805-292-23
0006
ELECTRICAL TROUBLESHOOTING - HORN INOPERATIVE
0006
Check 10A backup alarm/horn
Fuse okay?
Replace fuse (TM 5-3805-292-10).
NO
fuse (TM 5-3805-292-10).
YES
Disconnect LH control handle
from chassis harness (WP 0084).
While pressing and releasing
Horn button, check for continuity
Continuity present
between LH control handle
Replace LH control handle
w/ button pressed?
connector 50C-1 circuit 890AB
NO
Continuity NOT present
(O), handle side and LH control
w/button released?
handle connector 50C-2 circuit
892AB (O), handle side (WP
Connections).
YES
Press power button to turn power
to machine on (TM 5-3805-292-
10).
Perform Open Harness Test for
Measure voltage between LH
12V
NO
control handle connector 50-1
present?
circuit 890 (WP 0173).
circuit 890C (O), harness side
Handle Connections).
YES
Reconnect harness. Disconnect
horn (WP 0152).
While pressing and releasing
Horn button, measure voltage
12V
Perform Open Harness Test for
NO
between horn connector 40 circuit
present?
circuit 892 (WP 0173).
892A (O), harness side and
Miscellaneous Circuits).
YES
Check continuity between horn
Reconnect horn (WP 0152). Repair
connector 41 circuit 178AT (B),
Continuity
circuit 178AT or replace chassis wiring
harness side and ground
NO
present?
Miscellaneous Circuits).
YES
Replace horn (WP 0152).