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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, wire brush, battery terminal cleaner, safety gloves, and safety glasses.
• Disconnect the negative battery terminal using a socket wrench.
• Ensure the workspace is well-ventilated and free from hazards.

2. Clean Battery Terminals

• Sub-steps:
  • Inspect the battery terminals for corrosion.
  • Use a wire brush and terminal cleaner to remove any corrosion from the battery terminals and cable ends.
  • Reconnect the terminals securely, ensuring a tight fit.

3. Address Parasitic Draw

• Sub-steps:
  • If excessive draw is detected, start removing fuses one at a time while monitoring the multimeter reading until the draw drops to an acceptable level.
  • Identify the circuit corresponding to the fuse that eliminated the draw.
  • Inspect components connected to that circuit for faults or issues that could cause a drain.

4. Replace Faulty Components

• If any component (like a relay or accessory) is found to be faulty, remove the component and replace it with a new one.
• Follow the manufacturer’s specifications for installation and ensure all connections are secure.

5. Test Charging System

• Reconnect the negative battery terminal.
• Start the engine and measure the voltage at the battery again to ensure the alternator is charging properly.
• If the voltage is low, check the alternator and its connections for faults.