TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 922 of 1313
HORN INOPERATIVE - Continued
c.
Reconnect circuit 26 wire to horn solenoid.
d.
Disconnect circuit 25 wire from horn solenoid.
e.
Connect one end of jumper wire to vehicle chassis ground.
NOTE
If horn does not operate, horn solenoid is faulty.
f.
Touch other end of jumper wire to circuit 25 wire connection point on horn solenoid.
CONDITION/INDICATION
IS HORN SOLENOID OPERATING PROPERLY?
DECISION
YES - Go to Step (6).
NO - Replace defective horn solenoid (Volume 2, WP
0343). Go to Step (7) to verify problem is solved.
TM 9-2320-272-23-1
0109
0109-7
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