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I am 100% sure the rubber is conductive. I know we tested it to see how many ohms it was, and I don't remember exactly what it was but it was low.
Also we stuck one side of the multimeter on the frame and another on the positive terminal of the battery and read the voltage as we repetedly touched and removed the rubber from the frame. The reading would go 12V to 0V to 12V...
We had realized that the entire metal on the light was grounded, and we had mounted the light on lexan because of this. The only reason our frame was grounded was because a screw was touching the outside of the rubber (no other metal was touching the light).
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