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Third brake light voltage

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I'm replacing all external filament bulbs with LEDs and ran into a roadblock with the third brake light bulb. I've replaced both brake lights with LEDs and everything works fine (removed cruise control prior, not worried about it's functionality). Once I replaced the third brake light, all 3 brake lights glow at a half-dim kind of setting as soon as I turn the key one click. I don't need to step on the brake pedal or turn on running lights, they just glow as soon as power starts flowing. I traced the power leak to the third brake light receiving 6V all the time when power is on, and 12V when pedal is depressed. Is this normal?

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