why does my Porsche Cayenne E3 (2018-Present) battery keep dying

Solution

1. Preparation

• Gather all tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface, and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Clean Battery Terminals

• Tools Required: Wire brush, battery terminal cleaner, wrench/socket set
  • Remove the positive terminal followed by the negative terminal.
  • Inspect terminals for corrosion and clean with a wire brush or battery terminal cleaner.
  • Reconnect terminals securely, ensuring no corrosion remains.

3. Address Parasitic Drain

• Tools Required: Multimeter, fuses puller
  • Reconnect the negative battery terminal.
  • Set the multimeter to measure current and connect it in series between the negative terminal and the negative battery cable.
  • Pull fuses one at a time while monitoring the multimeter; if current drops significantly, the circuit related to that fuse is the source of drain.
  • Inspect the related components (e.g., lights, radio) for faults or shorts.

4. Test and Replace Battery (if necessary)

• Tools Required: Load tester, wrench/socket set
  • If the battery fails the load test, replace with a new battery of the same specifications (group size, cold cranking amps).
  • Install the new battery, connecting the positive terminal first followed by the negative terminal.

5. Alternator Inspection

• Tools Required: Multimeter
  • Start the engine and measure the voltage at the battery terminals with the engine running; it should read between 13.7 to 14.7 volts.
  • If the alternator is not charging properly, consider replacing it.