TM-9-2320-285-24-1
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-1 - Page 393 of 987
TM 9-2320-285-24-1
2-33.
HORN SYSTEM MAINTENANCE
a.
Horn and Relay (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
INSTALLATION
6
Horn (17)
a.
Bracket (16)
Position
On horn (17)
b.
Nut (15)
Install and
tighten
7
Front frame
a.
Bracket (16)
Position
On crossmember
crossmember
with horn (17)
b.
Capscrew (12),
Install and
lock washer
tighten
(14),
and nut
(13)
c.
Electrical lead
Connect
Push onto horn (17)
(5)
8
Right hand
a.
Bracket (11)
Position
On right hand frame rail stud
frame rail,
b.
Lock washer
Install and
front
(10) and nut
tighten
(9)
9
Relay (8)
a.
Three electri-
Connect
To relay (8).
Blue lead (5)
cal leads
to H,
orange/black lead (6)
(5 thru 7)
to B,
and green/orange lead
(7) to S.
Support relay
b.
Three screws
Tighten
Support relay (8)
(3)
10
Right hand
a.
Relay (8)
Position
On bracket (11) stud
frame rail,
b.
Lock washer (2)
Install and
front
and nut (1)
tighten
11
Battery
Battery ground
Connect
Para 2-34a
box
cable
12
Tractor
Horn and relay
Test
Check proper operation by
cab
turning key switch on and
depressing horn push button
2-370
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