Clean and replace corroded or damaged battery terminals and cables on a 1966 Chevrolet Corvette to ensure reliable electrical connections.

Warnings

Tools required

Parts

• Battery terminal set (positive and negative) × 1 — Use OEM specification or aftermarket lead terminals
• Battery cables (if replacement needed) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn off all electrical accessories and remove ignition key
3. Locate battery (mounted in engine compartment on driver side)
4. Prepare baking soda and water solution for cleaning corrosion if needed
5. Have replacement terminals ready if existing terminals are damaged beyond cleaning

Procedure

1. 1

   Disconnect negative battery terminal
   Using a 5/16" or 3/8" wrench (SAE), loosen the bolt securing the negative (black or unmarked) terminal cable to the battery post. Remove the cable from the post and position it away from the battery to prevent accidental contact. If the terminal is stuck due to corrosion, use a battery terminal puller rather than prying with a screwdriver to avoid damaging the battery.
2. 2

   Disconnect positive battery terminal
   Using a 5/16" or 3/8" wrench (SAE), loosen the bolt securing the positive (red) terminal cable to the battery post. Remove the cable from the post and keep it separated from any metal surfaces. Ensure the positive cable does not contact the negative cable or any grounded metal.
3. 3

   Inspect terminals and cables
   Examine both battery terminals and cable ends for heavy corrosion, cracking, or damage. Check cable insulation for cracks or fraying near the terminals. If terminals show excessive damage, deep cracks, or material loss beyond surface corrosion, replacement is required rather than cleaning.
4. 4

   Clean battery posts
   Using a wire brush or the internal portion of a battery terminal cleaning tool, clean the battery posts thoroughly until bare lead is visible and shiny. Clean both positive and negative posts. Remove all corrosion, oxidation, and buildup. If heavy corrosion is present, neutralize with baking soda solution first, then scrub clean and dry thoroughly.
5. 5

   Clean or replace terminals
   If terminals are salvageable, use a wire brush or the external portion of a battery terminal cleaning tool to clean the inside clamp surfaces until bright metal is visible. Remove all corrosion and buildup. If terminals are damaged or excessively corroded, replace with new terminals. For replacement, cut old terminals from cables if necessary and install new terminals according to terminal manufacturer instructions (crimp or bolt-on style).
6. 6

   Apply anti-corrosion coating
   Apply a thin layer of petroleum jelly or dielectric grease to the cleaned battery posts. This coating prevents future corrosion and ensures good electrical conductivity.
7. 7

   Reconnect positive terminal
   Place the positive (red) terminal cable onto the positive battery post. Ensure the terminal is fully seated and making complete contact with the post. Tighten the terminal clamp bolt firmly with a 5/16" or 3/8" wrench (SAE) until snug. The terminal should not rotate on the post when hand pressure is applied.
8. 8

   Reconnect negative terminal
   Place the negative (black or unmarked) terminal cable onto the negative battery post. Ensure the terminal is fully seated and making complete contact with the post. Tighten the terminal clamp bolt firmly with a 5/16" or 3/8" wrench (SAE) until snug. A small spark may occur when final contact is made; this is normal.
9. 9

   Apply external anti-corrosion coating
   After terminals are tightened, apply a light coating of petroleum jelly or dielectric grease over the top of both terminal connections. This provides additional corrosion protection to the external surfaces.
10. 10

    Clean battery case and tray
    Wipe down the battery case and battery tray with a damp rag to remove any corrosion residue or spilled electrolyte. If heavy corrosion is present on the tray, neutralize with baking soda solution and wipe clean. Ensure tray and hold-down hardware are secure.

Reassembly

1. Verify both terminals are tight and cannot be rotated by hand
2. Ensure no tools or metal objects are left near the battery
3. Reset clock and radio presets as needed

Verification

• Turn ignition key to ON position and verify dash lights illuminate
• Start engine to confirm proper electrical function
• Check that terminals remain tight and show no arcing or sparking during operation
• Verify all electrical accessories function normally (lights, horn, wipers)
• Inspect terminals after first week of operation for any signs of looseness or new corrosion

More procedures for this vehicle