To change the side marker light in a 1991 Chevy S10, first, locate the side marker light assembly on the front fender. Use a flathead screwdriver to carefully pry off the lens cover, then remove the old bulb by twisting it counterclockwise. Insert the new bulb by twisting it into place, and reattach the lens cover securely. Finally, test the light to ensure it’s functioning properly.
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