TM 5-3805-280-24-1
Sub-System Diagnostics
POWER CIRCUIT THEORY OF OPERATION
F17, dome light 5-amp fuse F18, auxiliary 10-amp fuse
The power circuit includes batteries, key switch,
F19 and radio 5-amp fuse F16.
battery relay, battery relay fuse, battery relay diode
and all other fuses.
With key switch turned to ON, battery relay K14 is
energized by power from key switch S1 terminal M to
With key switch OFF, battery power is available at
battery relay terminal S. Operating power from terminal
terminal BAT of key switch S1, terminals 1 and 3 of
A of the battery relay is applied to starter motor M1
alternator shut down relay K1, terminal 1 of starter
terminal B, fuel shutoff 40-amp fusible link F23, and
protection relay K11, and through battery power
through alternator power 60-amp fusible link F22 to
40-amp fusible link F21 to terminal B of battery relay
fuses F4, F6, F7, F8, F10, F11, F12, F13, F14 and
K14. Battery power is also applied to radio and monitor
F20. Operating power is also applied from key switch
controller backup 5-amp fuse F1, engine and pump
S1 terminal M to alternator excitation resistor R6 and
controller 10-amp fuse F2, and engine control (EC)
power on 10-amp fuse F5.
motor 10-amp fuse F3 and battery power 5 amp fuse
F9.
9015
Connection to an external battery source is provided
15
by 24-volt slave receptacle G5.
With key switch turned to ACC, battery power is
2
available at horn 10-amp fuse F15, lighter 10-amp fuse
CED,OUOE012,129
1915MAR991/1
4-67
