why does my Tesla Outback 5th Generation (2015-2019) battery die when the car is off

Solution

1. Preparation

• Gather necessary tools and safety equipment.
• Disconnect the battery negative terminal to prevent accidental short circuits.

2. Test for Parasitic Draw

• Sub-steps:
  • Connect the multimeter in series with the negative battery terminal.
  • Ensure all doors are closed and the vehicle is locked.
  • Record the current draw reading. A normal draw is usually below 50 mA.
• Tools Required: Multimeter.

3. Inspect and Replace Faulty Components

• Sub-steps:
  • Identify any components causing high current draw based on the multimeter reading.
  • Disconnect components one at a time to isolate the source of the draw.
  • Replace any malfunctioning switches, modules, or wiring.
• Tools Required: Socket set, screwdriver set.
• Safety Warnings: Ensure the vehicle is off and key is removed while working on electrical components.

4. Battery Maintenance

• Sub-steps:
  • Clean battery terminals and ensure a tight connection.
  • If the battery shows signs of wear (low voltage or poor load test), replace it with a new battery.
• Parts Required: New battery (if replacement is necessary).