This procedure replaces the ignition switch on a 1966 Chevrolet Corvette 327ci V8, requiring removal of the steering column cover and disconnection of the switch from the lock cylinder actuator rod.

Warnings

Tools required

Parts

• Ignition switch assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and set parking brake
2. Disconnect negative battery cable and isolate from battery post
3. Remove driver's seat for improved access if needed (2 bolts each side at seat track)
4. Allow steering column to cool if vehicle was recently driven

Procedure

1. 1

   Remove steering column lower trim cover
   Remove the 3 screws securing the lower steering column trim cover using a Phillips screwdriver. The screws are located along the bottom edge of the cover. Gently pull the cover away from the column and set aside.
2. 2

   Disconnect wiring harness
   Locate the ignition switch wiring harness connector on the back side of the switch. Press the locking tab and pull the connector straight off the switch terminals. Use needle nose pliers if necessary to release stubborn connector tabs. Note or photograph wire routing for reassembly.
3. 3

   Locate ignition switch mounting
   The ignition switch is mounted on the upper left side of the steering column jacket, just below where the lock cylinder enters the column. Use a flashlight to identify the 2 mounting screws holding the switch body to the column bracket.
4. 4

   Position lock cylinder for switch removal
   Using the ignition key, turn the lock cylinder to the OFF-UNLOCKED position (first position clockwise from LOCK). This aligns the actuator rod to allow the switch to be removed without binding.
5. 5

   Remove switch mounting screws
   Remove the 2 screws securing the ignition switch to the steering column bracket using a Phillips or flat blade screwdriver as appropriate. These are typically 1/4 inch sheet metal screws. Support the switch as you remove the second screw to prevent it from dropping.
6. 6

   Disengage actuator rod from switch
   Carefully pull the ignition switch away from the column while observing the actuator rod connection. The rod slides through a slot in the back of the switch. Angle the switch slightly and slide it off the actuator rod. The rod remains attached to the lock cylinder and should not be removed.
7. 7

   Inspect actuator rod and column
   With the old switch removed, inspect the actuator rod for wear, bending, or damage. The rod should move smoothly when the key cylinder is rotated. Check the column bracket mounting surface for cracks or damage. Clean any dirt or debris from the mounting area.
8. 8

   Position new ignition switch
   Position the new ignition switch so the actuator rod slot aligns with the actuator rod protruding from the lock cylinder mechanism. Ensure the lock cylinder is still in the OFF-UNLOCKED position. Slide the switch onto the rod until the switch body seats against the column bracket.
9. 9

   Install switch mounting screws
   Install the 2 mounting screws finger tight first to ensure proper alignment. Verify the switch sits flush against the bracket and the actuator rod moves freely through its slot. Tighten the screws securely but do not overtighten, as this can crack the plastic switch housing.
10. 10

    Reconnect wiring harness
    Push the wiring harness connector firmly onto the ignition switch terminals until the locking tab clicks into place. Tug gently on the connector to verify it is locked. Route the harness to avoid contact with moving steering column components.
11. 11

    Function test before reassembly
    Reconnect the negative battery cable temporarily. Insert the key and test all ignition switch positions: LOCK, OFF, RUN, and START. Verify that the starter engages only in START position and that accessories function in RUN. Disconnect battery cable again before continuing.
12. 12

    Reinstall steering column trim
    Position the lower steering column trim cover back onto the column. Ensure all wiring is tucked behind the cover and not pinched. Install the 3 Phillips screws and tighten securely. Verify the cover sits flush against the column with no gaps.

Reassembly

1. Reinstall driver's seat if removed, ensuring seat tracks are fully engaged and all 4 bolts are tightened
2. Reconnect negative battery cable and tighten terminal clamp securely

Verification

• Turn key to RUN position and verify dash warning lights illuminate properly
• Test START position and confirm starter engages and engine cranks
• Verify key can be removed only in LOCK position
• Test that steering wheel locks when key is removed and column is in LOCK position
• Check that all accessories (radio, wipers, heater) function in RUN position but not in OFF position
• Ensure no binding or resistance when turning key through all positions

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