SYSTEMS OPERATION
TM 5-3805-258-24-1
OPERATOR’S STATION
INDIVIDUAL CIRCUIT DESCRIPTION
BACK-UP ALARM
The back-up alarm warning system has a 3T1815 Alarm installed behind the
radiator. The alarm has a solid state (electrical, no moving parts) circuit that
makes the sound go on and off when it has current. The back-up alarm gets
power from the 10 amp fuse marked “STOP LIGHTS & BACK-UP
ALARM” on the fuse panel under the instrument panel. The back-up alarm is
controlled by a 9N1750 Microswitch that is part of the transmission neutralizer
group. The switch is inside an aluminum housing where the forward-reverse
transmission cable is fastened to the transmission. The switch stays open in
NEUTRAL and FORWARD, but closes when the transmission is put in
REVERSE.
B A C K - U P A L A RM
1. Back-up alarm.
B A C K - U P A L A R M S W I T CH
2. Back-up alarm switch.
Transmission in Reverse
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