o2 sensor wires

[zpexploder]

Which of the 4 wires on my 96 explorer 5.0 is the voltage output?

 

[V8 Level II]

These are the color codes for the front O2 sensors in the truck harness:

DS: red/black
(to PCM pin 87)

PS: gray/light blue
(to PCM pin 60)

Bosch sensors usually use a solid black signal wire in the pigtail of the sensor itself. Each black wire should plug to the corresponding harness color code shown above.