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3
OBSERVER™ 4120 HARDWARE USER GUIDE
Main Wiring Diagram
Wiring Connections
Wiring Connections
Power Harness
Recommended Sensor
Connections (12V)
Red
Power (12 - 32V DC)
Sensor 8
Stop Arm Lights (school bus)
Black
Ground
Sensor 7
Amber Warning Lights (school bus)
White
Ignition (Yellow on some models)
Sensor 6
Door (or wheel chair lift)
Sensor 5
Head Lights
Sensor 4
Event Button
Sensor 3
Brake Lights
Sensor 2
Left Turn Signal
Sensor 1
Right Turn Signal
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