TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 76 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-15.
ELECTRICAL SYSTEM (Continued).
f.
Electric Horn.
BATTERY PACK.
Consists of four, 12-volt, maintenance free batteries.
Two batteries are wired in parallel in each set.
Each set is connected in series for 24-volt output.
Battery pack is used for both 12-volt
and 24-volt output.
CIRCUIT BREAKER (CB-5).
Protects electrical
components of
horn circuit by opening when load exceeds 20 amperes.
May be manually reset by pressing CB-5 button in.
BLACKOUT TOGGLE SWITCH.
Two-position switch for NORMAL and BLACKOUT modes of operation.
With switch
set
to NORMAL and horn
button depressed, 12-volt power from circuit breaker passes through switch contacts to relay.
HORN BUTTON.
Pushing this button activates horn circuit and energizes horn.
RELAY
(RY-1).
Normally open contacts are closed by 12-volt power from blackout toggle switch when horn button is
depressed.
With relay deenergized, 12 volts are supplied from a second lead from circuit breaker,
through contacts of
relay to horn.
ELECTRIC HORN.
The horn
is energized by 12-volt power
when horn button is
TA 236781
1-56
Back to Top
