Complete replacement of both positive and negative battery cables on a 1966 Chevrolet Corvette with 327ci V8, ensuring proper electrical connections and corrosion-free terminals.

Warnings

Tools required

Parts

• Positive battery cable assembly × 1 — Use OEM specification or aftermarket equivalent for 1966 Corvette 327 V8
• Negative battery cable assembly × 1 — Use OEM specification or aftermarket equivalent for 1966 Corvette 327 V8
• Battery terminal anti-corrosion spray or grease × 1 — Generic

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Turn ignition off and remove keys.
3. Open hood and secure with prop rod.
4. Identify battery location (passenger side behind seat in 1966 Corvette).
5. Inspect new battery cables to verify correct length and terminal fitment before beginning removal.

Procedure

1. 1

   Disconnect negative battery cable
   Using a 10mm wrench or socket, loosen the negative (-) battery terminal bolt on the battery post. The negative terminal is typically marked with a minus sign and may have a black cable. Loosen the bolt sufficiently to lift the terminal clamp off the battery post. Move the cable end away from the battery post and position it where it cannot accidentally contact the terminal.
2. 2

   Disconnect positive battery cable
   Using a 10mm wrench or socket, loosen the positive (+) battery terminal bolt on the battery post. The positive terminal is marked with a plus sign and typically has a red cable. Remove the terminal clamp from the battery post and move it clear of the battery.
3. 3

   Remove negative cable from engine ground
   Locate where the negative battery cable attaches to the engine block or frame ground point. Using a 13mm wrench or socket, remove the bolt securing the cable ground terminal to the engine block. The ground point on the 1966 Corvette is at the engine block or chassis; verify the original ground location for this specific car before removal. Remove the cable completely from the vehicle.
4. 4

   Remove positive cable from starter solenoid
   Locate the positive battery cable connection at the starter solenoid, mounted on the passenger side of the engine. Using a 13mm wrench or socket, remove the nut securing the positive cable terminal to the solenoid BAT terminal stud. Note the routing of the cable through any clips or supports for reinstallation. Remove the cable completely from the vehicle.
5. 5

   Clean battery terminals and connection points
   Using a wire brush or battery terminal cleaner, thoroughly clean both battery posts, removing all corrosion and oxidation until bare lead is visible. Clean the engine block ground mounting surface and starter solenoid stud with a wire brush to ensure bare metal contact. Inspect the battery for any cracks or leaks; replace battery if damaged.
6. 6

   Install new positive battery cable
   Route the new positive battery cable from the battery location to the starter solenoid, following the original path and securing in any factory clips or supports. Attach the terminal end to the starter solenoid BAT stud and secure with the 13mm nut. Tighten firmly but do not overtighten and strip threads. Do not connect to battery post yet.
7. 7

   Install new negative battery cable
   Route the new negative battery cable from the battery location to the engine block ground point. Position the terminal ring over the ground bolt hole on the engine block and secure with the 13mm bolt. Tighten securely to ensure good electrical contact with clean metal. Do not connect to battery post yet.
8. 8

   Connect positive cable to battery
   Place the positive cable terminal clamp over the positive (+) battery post. Using a 10mm wrench or socket, tighten the terminal bolt until the clamp is snug on the post. Ensure the connection is tight but avoid excessive force that could damage the battery post. The terminal should not rotate on the post when hand pressure is applied.
9. 9

   Connect negative cable to battery
   Place the negative cable terminal clamp over the negative (-) battery post. Using a 10mm wrench or socket, tighten the terminal bolt until the clamp is snug on the post. You may observe a small spark when making final contact; this is normal as the initial circuit load draws current.
10. 10

    Apply corrosion protection and verify connections
    Spray or apply anti-corrosion compound to both battery terminals and cable connections. Verify all connections are tight by attempting to rotate each terminal by hand; they should not move. Check that cables are routed clear of exhaust manifolds, sharp edges, and moving components.

Reassembly

1. Ensure all cable routing matches original path and cables are secured in factory clips.
2. Verify no cables contact hot exhaust components or moving parts like belts or fan.
3. Reset clock and radio presets as needed.

Verification

• Turn ignition key to ON position (do not start) and verify all dashboard lights illuminate normally.
• Start the engine and verify it cranks normally with no sluggish behavior.
• Check that all electrical accessories function properly (lights, horn, wipers, radio).
• Visually inspect all battery cable connections for tightness and proper contact.
• With engine running, verify no voltage drop by testing battery voltage at terminals (should read 13.5-14.5 volts with engine running).

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