Turn Signal Bulb - Rear

Replace the rear turn signal bulb assembly on a 1966 Chevrolet Corvette by accessing the lens from the exterior and replacing the failed bulb.

Warnings

Tools required

Parts

• 1157 dual-filament turn signal bulb × 1 — 1157
• Tail light lens gasket × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn off all lights and remove ignition key
3. Allow tail lights to cool if vehicle was recently operated

Procedure

1. 1

   Locate tail light lens assembly
   Identify the rear tail light assembly on the affected side of the vehicle. The 1966 Corvette has round tail light lens assemblies recessed into the rear body, with the turn signal/brake/tail function provided by a dual-filament bulb in the housing.
2. 2

   Remove lens retaining screws
   Using a Phillips head screwdriver, remove the screws securing the tail light lens to the body (verify exact count for your assembly). These screws are visible from the exterior and arranged around the perimeter of the round lens.
3. 3

   Remove lens assembly
   Carefully pull the lens assembly straight outward from the body. The lens gasket may stick to either the lens or body; note its position for reinstallation.
4. 4

   Access turn signal bulb socket
   With the lens removed, locate the turn signal bulb socket in the lower position of the housing. The 1966 Corvette uses a bayonet-style socket accessible from the rear of the housing.
5. 5

   Remove bulb from socket
   Press the bulb inward gently and rotate counterclockwise approximately 1/4 turn until the bulb releases from the bayonet mount. Pull the bulb straight out of the socket.
6. 6

   Inspect socket and wiring
   Examine the bulb socket for corrosion, heat damage, or burned contacts. Check wiring connections for integrity. Clean any minor corrosion with a clean cloth. If socket shows significant damage, replacement is required before installing new bulb.
7. 7

   Install new bulb
   Insert the new 1157 dual-filament bulb into the socket, aligning the offset pins with the socket slots. Press inward gently and rotate clockwise 1/4 turn until the bulb locks into place.
8. 8

   Test bulb operation
   Before reinstalling the lens, turn the ignition on and activate the turn signal to verify the new bulb illuminates and flashes properly. Also test the brake light and running/tail light function for that filament. If bulb does not illuminate, verify socket connection and bulb installation orientation.
9. 9

   Inspect and position lens gasket
   Examine the lens gasket for tears, compression set, or deterioration. Replace if damaged to prevent moisture intrusion. Position the gasket on the lens or body opening, ensuring proper alignment around the entire perimeter.
10. 10

    Reinstall lens assembly
    Align the lens assembly with the body opening and press firmly to seat the gasket. Ensure all bulb sockets align properly with their respective holes in the lens.
11. 11

    Install lens retaining screws
    Install the lens retaining screws through the lens into the body (match the count removed). Start all screws by hand before tightening. Tighten gradually and evenly to ensure even gasket compression and prevent lens cracking. Snug firmly but do not overtighten as excessive force can crack the lens.

Reassembly

1. Ensure lens gasket is properly seated with no gaps that could allow moisture intrusion
2. Verify all lens screws are snug but not overtightened to prevent lens damage

Verification

• Turn ignition to accessory position and activate both left and right turn signals to verify proper operation
• Verify running lights illuminate when headlight switch is activated
• Check for proper lens sealing with no visible gaps around gasket
• Visually inspect that lens is flush and evenly seated against body

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