why does my Ford Mustang S650 (2024-Present) battery die when parked overnight

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, multimeter, socket set, wire brush, ammeter, safety gloves.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Clean Battery Terminals

• Remove the negative terminal followed by the positive terminal from the battery.
• Use a wire brush to clean any corrosion from the battery terminals and cable ends.
• Reconnect the positive terminal first, then the negative terminal.

3. Replace the Battery (if necessary)

• If the battery is determined to be faulty during testing:
  1. Remove the battery hold-down clamp using a socket set.
  2. Carefully lift the battery out of the tray.
  3. Place the new battery into the tray, ensuring correct orientation.
  4. Reattach the hold-down clamp securely.
  5. Connect the positive terminal first, followed by the negative terminal.

4. Address Parasitic Draw (if applicable)

• If parasitic draw is identified:
  1. Disconnect the negative battery terminal.
  2. Connect an ammeter in series with the negative terminal and battery cable.
  3. Identify circuits that are drawing excessive current and trace them to their source.
  4. Repair or replace faulty components or wiring as needed.