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To replace a turn signal bulb in a 2015 Ford F350, begin by opening the hood to access the bulb. Use a Phillips head screwdriver to unscrew the single screw on the access panel by turning it clockwise. Then locate the dust cap and turn it 1/4" clockwise to loosen it for removal. Release the tab on the black plastic power connector and disconnect the plug from the low beam bulb. Remove the old bulb and replace it with a new one. The correct headlight bulbs are labeled as 3157, and they can be purchased for a price ranging from $5 to $15 depending on the brand and quality.
Remove the bulb from the rear lens that can be taken out.
First, switch off the headlight, then pop the hood. Next, unscrew the plastic headlight cover and metal bulb holder. Pull out the old bulb and swap it for a new one. Finally, put everything back in reverse order.