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2002 ASTRO Van Tail light Mystery bulb

washburnerwashburner Posts: 3
edited December 2013 in Chevrolet

My 2002 ASTRO tailight has two ordinary bulbs for the lights, turn and backup. In the middle of the housing is a small silver bulb about the size of a pea. I broke it trying to remove it. I CANNOT see what it does - Everything works after I replaced the regular turn signal bulb. I searched and the socket looks like a "SIDE MARKER" socket - but there is no side marker in the rear. And I cannot find a replacement bulb spec. What the heck is that small bulb in the middle for??

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