Headlight Bulbs - Pair

This procedure covers the removal and replacement of both sealed beam headlight units on a 1972 Ford F-100 with 302ci V8 engine.

Warnings

Tools required

Parts

• 7-inch sealed beam headlight units × 2 — Use OEM specification or equivalent Type 2 sealed beam

Preparation

1. Park vehicle on level surface and turn off ignition
2. Disconnect negative battery cable from battery terminal
3. Allow headlight assemblies to cool completely if vehicle was recently operated
4. Open hood and secure with prop rod

Procedure

1. 1

   Remove headlight bezel trim ring
   Locate the chrome headlight bezel trim ring on the front of the headlight assembly. Remove the 3 Phillips head screws securing the bezel trim ring to the headlight bucket. These screws are visible from the front of the vehicle. Carefully pull the bezel trim ring forward and away from the vehicle, taking care not to drop or damage the chrome finish.
2. 2

   Remove headlight retaining ring
   With the bezel removed, locate the inner headlight retaining ring that holds the sealed beam unit in place. Remove the 3 Phillips head screws that secure this retaining ring. Note that these screws are different from the outer bezel screws and only hold the sealed beam assembly. Do not remove the headlight aim adjustment screws located at approximately 12 o'clock and 9 o'clock positions on the bucket.
3. 3

   Remove sealed beam unit
   Carefully pull the sealed beam headlight unit forward approximately 2 inches away from the headlight bucket housing. The unit will still be connected by the wiring harness. Support the sealed beam unit with one hand while working.
4. 4

   Disconnect electrical connector
   Locate the 3-prong electrical connector at the rear of the sealed beam unit. Firmly grip the connector body and pull straight back to disconnect it from the sealed beam terminals. Do not pull on the wires themselves. Remove the old sealed beam unit and set aside.
5. 5

   Inspect wiring and connector
   Examine the 3-prong connector for corrosion, melted plastic, or damaged pins. Check the wiring harness for cracking, heat damage, or exposed conductors. If connector shows corrosion, clean with electrical contact cleaner. Replace connector or repair wiring if damage is present.
6. 6

   Install new sealed beam unit
   Remove new sealed beam unit from packaging, handling only by the edges. Orient the unit so the terminal prongs at the rear match the connector configuration, with the word TOP or embossed arrows pointing upward. Push the 3-prong connector firmly onto the sealed beam terminals until fully seated and locked.
7. 7

   Position sealed beam in bucket
   Carefully guide the sealed beam unit into the headlight bucket, ensuring the wiring harness routes cleanly without pinching. Position the sealed beam so the mounting tabs on the lens rim align with the slots in the headlight bucket. The unit should sit flush against the bucket with no gaps.
8. 8

   Install headlight retaining ring
   Place the inner retaining ring over the sealed beam unit, aligning the 3 screw holes with the threaded holes in the headlight bucket. Ensure the retaining ring tabs engage the sealed beam unit properly. Install the 3 Phillips head screws and tighten evenly in a star pattern to avoid cocking the sealed beam. Screws should be snug but not overtightened to avoid cracking the sealed beam lens.
9. 9

   Install headlight bezel trim ring
   Position the chrome bezel trim ring over the headlight assembly, aligning the 3 screw holes with the threaded holes in the fender. Install the 3 Phillips head screws and tighten until bezel is flush against the fender surface. Ensure bezel is seated evenly around its perimeter.
10. 10

    Repeat for opposite side
    Repeat steps 1 through 9 for the headlight assembly on the opposite side of the vehicle. Both headlights should be replaced as a pair to ensure even light output and color temperature.

Reassembly

1. Reconnect battery negative cable to battery terminal
2. Close hood and ensure it latches properly
3. Clean any fingerprints from chrome bezels with clean cloth

Verification

• Turn headlight switch to ON position and verify both headlights illuminate with proper intensity
• Check that both low beam and high beam functions operate correctly
• Verify headlight aim has not been disturbed during installation; adjust if necessary using aim adjustment screws
• Inspect all bezel trim rings for proper fit and alignment with no gaps
• Confirm no warning lights appear on instrument cluster
• Test headlights with engine running to verify proper charging system operation

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