🔧 Headlights - Bulb Replacement

On your F-350, the headlight bulbs are accessed from behind each headlamp housing under the hood. The job is mostly about making a little room to reach the bulb, swapping it without touching the glass, and confirming both high and low beams work.

Difficulty Level: Beginner | Estimated Time: 30-75 minutes

Assumption: You’re replacing the main headlight bulbs (low/high beam), not fog or marker bulbs.

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⚠️ Safety & Precautions

• ⚠️ Let the headlights cool first; bulbs get extremely hot.
• ⚠️ Do not touch the new bulb’s glass with bare fingers; skin oil can shorten bulb life.
• ⚠️ If equipped with HID (xenon) headlights, the system uses high voltage; keep the switch OFF and do not power the lights with parts disconnected.
• ⚠️ Keep keys out of the truck so lights don’t auto-turn on.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Flat-blade screwdriver
• 8mm socket
• 1/4" drive ratchet
• 1/4" drive extension 6"
• Flashlight
• Clean paper towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Headlight bulb (halogen type, typically 9008/H13) - Replace in pairs - Qty: 2
• Headlight bulb (HID/xenon type, commonly D3S) - Replace in pairs - Qty: 2

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📋 Before You Begin

• Park on level ground, shift to Park, and turn the headlight switch OFF.
• Open the hood and use a flashlight to look behind each headlamp for the bulb connector and dust cover (if equipped).
• Put on nitrile gloves and safety glasses.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Make room to reach the passenger-side bulb

• Locate the air intake tube/ducting near the passenger-side headlamp.
• Use an 8mm socket, 1/4" drive ratchet, and 6" extension to loosen the intake hose clamp(s) enough to move the tube slightly.
• Use a flat-blade screwdriver if a clamp uses a screw head instead of an 8mm hex.
• Gently reposition the tube for hand clearance. Don’t force plastic parts.

Step 2: Remove the passenger-side bulb connector

• Reach behind the passenger headlamp and find the electrical connector on the rear of the bulb.
• Press the connector lock tab with your thumb (or carefully with a flat-blade screwdriver) and pull the connector straight off.
• If there’s a round dust cap, twist it off by hand and set it aside.

Step 3: Remove the passenger-side bulb

• Grip the bulb base (the plastic part), then rotate it counterclockwise to unlock.
• Pull the bulb straight out of the housing.
• Set the old bulb aside on a clean paper towel.

Step 4: Install the new passenger-side bulb

• With nitrile gloves on, insert the new bulb into the housing, aligning the tabs so it sits flush.
• Rotate the bulb clockwise until it locks.
• Reinstall the dust cap (if equipped) by hand.
• Reconnect the electrical connector by pushing it on until it clicks.

Step 5: Make room to reach the driver-side bulb

• Behind the driver-side headlamp, clearance is usually tight near the battery/fuse area.
• Use a flashlight to locate the bulb connector and dust cap.
• If a plastic air duct or cover blocks your hand, carefully release its clips using a flat-blade screwdriver and move it aside.

Step 6: Remove and replace the driver-side bulb

• Remove the connector by pressing the lock tab and pulling straight back (use a flat-blade screwdriver gently if needed).
• Remove the dust cap by hand (if equipped).
• Rotate the bulb counterclockwise by hand and pull it straight out.
• Install the new bulb (gloves on), rotate clockwise to lock, reinstall dust cap, and reconnect the connector until it clicks.

Step 7: Reassemble the intake tube/ducting

• Reposition the passenger-side intake tube back where it was.
• Use an 8mm socket and 1/4" drive ratchet (or flat-blade screwdriver) to snug the clamp(s).

Step 8: HID-equipped note (only if your truck has HID/xenon)

• If you see an HID warning label on the headlamp or a metal igniter/module on the bulb, do not force anything.
• Remove and install the bulb the same way (unlock/lock), but handle the base carefully and keep the headlight switch OFF during the entire process.

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✅ After Repair

• Turn the headlights ON and verify low beam works on both sides.
• Switch to high beam and verify both sides work.
• If a bulb doesn’t light, turn lights OFF and re-check the connector is fully seated and the bulb is locked in place.
• At night, confirm beam aim looks even; if one side looks off, the bulb may not be fully seated.

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💰 DIY vs Shop Cost

Shop Cost: $90-$250 (parts + labor)

DIY Cost: $30-$200 (parts only, depends on halogen vs HID)

You Save: $60-$150 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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