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Hi Dave,
When I look at the schematic, power is entering the sensor at pin 54, and it exits through pins 54L, 54R, and S.
So, when I disconnected the car battery all power to the circuit was lost. In retrospect I should have realized that with the brake pedal not pushed, power is not available to the circuit anyways. As long as I don't push the pedal I will not get a conflict of power sources.
When I connected the external battery to pin 54 and the light came on in the NEW sensor, what does that tell me? That power is now able to traverse the sensor, run through the wiring at pin S and light the high mount bulb. BUT when I just put everything back together and hit the pedal, the high mount bulb does not light.
AND the light did NOT come on in the OLD sensor. [not shouting here, just emphasizing!] So power is NOT traversing the sensor and exiting through pin S on the old sensor.
Conclusions:
1. stick with the new sensor
2. check the power from the pedal with the sensor pulled out.
3. check the brown/yellow wire connector for continuity. I think it is position 5 on the connector.
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