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I checked this. With a ground to the car's battery, I got around 3 volts on the center plug (positive) wire. Then I ran a positive from the battery, and I got 12.49 volts on the outer 2 black wires. For giggles I tried the positive to the center (allegedly positive) red wire and also got 12.49 volts too. I went back and got a negative and tested the center wire and got nothing.
Previously when I had checked the positive I had gotten erratic readings--some times nothing, some times 6 volts.
So does this indicate I have a problem with the positive? Maybe it's grounded? Any advice on where to look for the origin would be appreciated, but I will be googling how to remove the trim from the A pillar to trace it.
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