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