why does my Volkswagen Golf MK7.5 (2020-Present) battery die when parked

Solution

1. Preparation

• Tools Required: Multimeter, ammeter, socket set, wire brush, battery terminal cleaner
• Disconnect the negative terminal of the battery. Allow the vehicle to sit for at least 15 minutes before proceeding.

2. Clean Battery Terminals

• Sub-steps:
  • Use a wire brush and battery terminal cleaner to remove corrosion from the battery terminals.
  • Ensure the connections are tight and secure before reconnecting.

3. Address Parasitic Draw

• Sub-steps:
  • If the ammeter reading exceeds 50 milliamps with the vehicle off, identify the circuit causing the draw.
  • Disconnect components or fuses related to high-draw circuits and retest until the draw is within normal parameters.
  • Repair or replace any faulty components, such as modules or sensors, as necessary.

4. Replace Battery (if necessary)

• Sub-steps:
  • If the battery is old or unable to hold a charge (below 12.4 volts), replace it with a new, compatible battery.
  • Install the new battery and ensure all connections are secure.