🔧 F-250 Super Duty - Taillight Bulb Replacement

You’ll remove each taillight assembly, twist out the bulb socket, and swap the bulb(s). This restores proper tail/running lights, brake lights, and turn signals so you stay visible and legal.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

Assumption: You mean the main rear stop/turn/tail bulbs on both left and right taillights.

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⚠️ Safety & Precautions

• ⚠️ Park on level ground, shift to Park, and set the parking brake.
• ⚠️ Turn the headlight switch OFF and remove the key before unplugging bulbs.
• ⚠️ Let bulbs cool before touching; they can be hot.
• ⚠️ Don’t touch new glass bulbs with bare fingers; oil can shorten bulb life.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4" drive ratchet
• 6" 1/4" drive extension
• Plastic trim removal tool
• Nitrile gloves
• Safety glasses
• Clean shop towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear stop/turn/tail bulb (3157 type) - Qty: 2
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park the truck on a flat surface with room behind it.
• Open the tailgate to access the taillight fasteners.
• Lay a clean shop towel where you’ll set the taillight to avoid scratches.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the left taillight screws

• Open the tailgate.
• Use a 8mm socket, 1/4" drive ratchet, and 6" extension to remove the two taillight screws on the inner edge (tailgate side).
• Set the screws aside where they won’t get lost.

Step 2: Pull the taillight assembly out

• Grip the taillight and pull it straight rearward to release the alignment pins.
• If it’s stuck, use a plastic trim removal tool to gently help it start moving. (A trim tool is a plastic pry tool that helps you pry without scratching paint.)
• Pull straight back—don’t twist.

Step 3: Remove the bulb socket

• Find the main bulb socket for the stop/turn/tail function (usually the larger socket).
• Twist the socket counterclockwise by hand to unlock it, then pull it out of the housing.
• Wear nitrile gloves and use a clean shop towel to keep things clean.

Step 4: Replace the bulb

• Pull the old bulb straight out of the socket (wiggle gently if needed).
• Install the new 3157 type bulb by pushing it straight in until fully seated.
• Apply a very thin wipe of dielectric grease to the socket seal area (not on the bulb glass).

Step 5: Reinstall the socket and taillight

• Insert the socket into the taillight and twist clockwise to lock.
• Line up the taillight alignment pins and push the assembly straight in until it sits flush.
• Reinstall the two screws using a 8mm socket, ratchet, and extension.
• Torque to 2-3 Nm (18-27 in-lbs) (snug only—do not overtighten).

Step 6: Repeat on the right side

• Repeat Steps 1-5 on the right taillight using the same 8mm socket setup and plastic trim removal tool as needed.

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✅ After Repair

• Turn the headlights on and confirm both rear running lights work.
• Press the brake pedal and confirm both brake lights are bright.
• Turn on left and right turn signals and confirm normal flash speed.
• If a bulb doesn’t work, remove the socket and re-seat the bulb fully.

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💰 DIY vs Shop Cost

Shop Cost: $60-$150 (parts + labor)

DIY Cost: $10-$30 (parts only)

You Save: $50-$120 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

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