Remove and replace the audio amplifier on a 1966 Chevrolet Corvette, typically located behind the kick panel or under the dash.

Warnings

Tools required

Parts

• Audio amplifier × 1 — Use OEM specification or aftermarket equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and secure away from terminal
3. Allow interior to cool if vehicle has been in direct sunlight
4. Gather all tools and replacement amplifier
5. Have camera or phone ready to document wiring connections before removal

Procedure

1. 1

   Locate the amplifier
   Identify amplifier location. The 1966 Corvette has no factory amplifier, so any unit present is aftermarket and could be mounted in numerous custom locations (behind a kick panel, under the dash, behind the center console, in the rear storage area behind the seats, or in a custom enclosure). Trace the speaker and power wiring from the head unit to locate the actual installed position. Inspect these areas to locate the unit.
2. 2

   Remove interior trim panels
   Remove the kick panel or lower dash panel to access the amplifier. Remove the fasteners securing the kick panel (count and type vary—verify against your specific trim configuration), then gently pull the panel away from the firewall. Use a trim removal tool if necessary to release any remaining clips without damaging the panel.
3. 3

   Document wiring connections
   Before disconnecting any wires, photograph all connections to the amplifier from multiple angles. Use masking tape and marker to label each wire harness connector with its position (e.g., 'INPUT LEFT', 'SPEAKER FRONT RIGHT', 'POWER', 'GROUND'). This documentation is critical for correct reinstallation.
4. 4

   Disconnect power and ground wires
   Locate the power wire (typically red or yellow with inline fuse) and ground wire (typically black) connected to the amplifier. Disconnect the power wire first by removing the ring terminal or unplugging the connector. Then disconnect the ground wire from the amplifier chassis.
5. 5

   Disconnect input signal wires
   Disconnect the RCA-style or direct wire input connections coming from the head unit or radio. These are typically low-voltage signal wires and may use small push-on connectors or screw terminals. Keep left and right channel connections clearly labeled and separated.
6. 6

   Disconnect speaker output wires
   Disconnect all speaker output wires from the amplifier terminals. These are typically larger gauge wires secured with screw terminals or spring-loaded connectors. Note the polarity markings (positive/negative) for each speaker channel before removal.
7. 7

   Disconnect remote turn-on wire
   If present, disconnect the remote turn-on wire (typically blue or blue with white stripe) that signals the amplifier to power on when the head unit is activated. This wire uses a small spade or bullet connector.
8. 8

   Remove amplifier mounting hardware
   Remove the mounting screws or bolts (typically 4, but verify on your unit) securing the amplifier to its mounting bracket or vehicle structure. Support the amplifier with one hand while removing the final fastener to prevent it from falling.
9. 9

   Remove amplifier from vehicle
   Carefully maneuver the amplifier out of its mounting location, taking care not to snag any remaining wires or damage surrounding interior panels. Inspect the mounting location for any corrosion, loose wires, or debris that should be addressed before installing the new unit.
10. 10

    Prepare new amplifier
    Unpack the replacement amplifier and verify it matches the old unit's specifications and mounting configuration. If the new amplifier has different dimensions, you may need to fabricate a new mounting bracket or adapt the existing one. Verify all input and output connections match the existing wiring.
11. 11

    Mount new amplifier
    Position the new amplifier in the mounting location with the heat sink facing outward for proper airflow. Ensure adequate clearance from any metal surfaces that could cause grounding issues. Secure the amplifier with its mounting screws, tightening in a cross pattern to ensure even pressure. Do not overtighten as this may crack the amplifier housing.
12. 12

    Connect speaker output wires
    Connect the speaker output wires to the new amplifier, referencing your labels and photographs. Ensure correct polarity for each channel (positive to positive, negative to negative) to prevent phase cancellation. Tighten screw terminals firmly but do not strip threads.
13. 13

    Connect input signal wires
    Connect the input signal wires from the head unit to the new amplifier's input terminals, maintaining correct left/right channel assignment and proper shielding connections if applicable. Ensure RCA connectors are fully seated or wire connections are secure.
14. 14

    Connect remote turn-on wire
    If applicable, connect the remote turn-on wire to the designated terminal on the new amplifier. Verify the connection is secure to ensure the amplifier powers on with the head unit.
15. 15

    Connect power and ground wires
    Connect the ground wire first, ensuring a clean, tight connection to the amplifier's ground terminal. Then connect the power wire, verifying the inline fuse is properly seated and rated correctly for the new amplifier's power requirements. Double-check that no bare wire is exposed that could short to vehicle chassis.

Reassembly

1. Verify all wire connections are secure and properly insulated before proceeding
2. Reconnect the negative battery cable
3. Before reinstalling trim panels, test the amplifier by turning on the audio system and checking all speakers for proper function
4. Reinstall kick panel or dash trim panel, ensuring all clips and fasteners are properly seated
5. Verify trim panels are flush and secure with no rattles

Verification

• Turn ignition to accessory position and power on the audio system
• Verify amplifier power LED illuminates when system is turned on
• Test each speaker individually using balance and fader controls to confirm proper channel operation
• Listen for distortion, humming, or other abnormal sounds that could indicate incorrect wiring
• Verify amplifier does not produce excessive heat after 10-15 minutes of operation
• Check that amplifier powers off completely when head unit is turned off
• Inspect all interior trim panels for secure fitment with no gaps or rattles

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