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For those with sedans, how easy would it be to make the trunk light into a double element light...i want the inside tail light to light up like the outside light, in that as normal the tail light comes on with the parkers, but now the brake light also comes on like on the outside tail light.

 
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that would be neat. unfortunately, the inner parking light is a small 194 bulb. you would have to somehow dremel or carve a bigger hole and mount a 7443 bulb and holder like the brake light has. then get wires from the other brake light. but it might be too much power for those small stock wirers to carry. it would be alot of work but doable.