TM 5-3805-281-24-1
Sub-System Diagnostics
ACCESSORY CIRCUITS OPERATIONAL INFORMATION
In order for the circuits to function, the key switch must
be in the ACC or ON position.
CED,OUOE012,21 1931OCT981/1
ACCESSORY CIRCUITS THEORY OF OPERATION
9015
Power from dome light 5-amp fuse F18 is applied to
The accessory circuits include the horns (B25, B26),
15
37
dome light switch S3. When the switch is turned ON,
the cab dome light (E3), and the 24-volt power plug
power is applied to cab dome light E3, turning the light
(G4).
on.
Power from horn 10-amp fuse F15 is applied to
Power from lighter 10-amp fuse F17 is applied to
terminal 1 and 3 of horn relay K5. When horn switch
24-volt power plug G4.
S2 is pressed, the closed contacts of the switch apply
ground to terminal 2 of the horn relay, and the relay is
energized. With the relay is energized, power is
applied from relay terminal 5 to high and low note
horns B25 and B26, sounding the horns.
CED,OUOE012,22 1931OCT981/1
