Locating and Replacing the Battery in a 2005 Lincoln LS

The battery in a 2005 Lincoln LS is located in the engine compartment, on the passenger side, near the firewall. Access is straightforward but requires a few tools and safety precautions.

Step-by-Step Removal

1. Open the hood and secure it with the prop rod.
2. Locate the battery – passenger side, rear of engine bay, under a plastic cover (may have a handle).
3. Remove the cover (unclip or unscrew).
4. Disconnect the negative (–) terminal first: Loosen the 10 mm nut, wiggle the clamp off. Critical: Always negative first to prevent short circuits.
5. Disconnect the positive (+) terminal: Same process. Red cable, + marking.
6. Remove the hold-down clamp: Usually a 10 mm or 13 mm bolt at the base of the battery tray. Keep the hardware.
7. Lift the battery out – it's heavy (~40–50 lbs). Use legs, not back.

Installation (Reverse Order)

1. Place new battery (Group Size H6 / 48 / 66L – verify in owner's manual).
2. Secure hold-down clamp.
3. Connect positive (+) first, tighten.
4. Connect negative (–) second, tighten.
5. Replace cover, close hood.
6. Reset clock, radio presets, window auto-up/down (hold buttons 5 sec after full close/open).

Safety Notes

• Wear safety glasses and gloves.
• No smoking, sparks, open flames—batteries emit hydrogen gas.
• If battery is cracked/leaking, neutralize with baking soda/water, dispose at retailer.
• Recycle old battery (core charge refund at auto parts stores).

Pro tip: Clean terminals with a wire brush and apply dielectric grease to prevent corrosion.