why does my Volkswagen Golf Eighth Generation (2020-present) battery light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery by removing the negative terminal first.
• Ensure you are working in a well-ventilated area and wear safety glasses.

2. Battery and Terminal Inspection

• Remove the battery terminals (negative first, then positive).
• Clean any corrosion from the battery posts and terminals using a wire brush.
• Inspect the battery for any physical damage or swelling; replace if necessary.

3. Alternator Inspection

• Locate the alternator and visually inspect it for any signs of damage or wear.
• Check the serpentine belt for proper tension and wear; replace if it is cracked or loose.
• If needed, remove the alternator for bench testing or replacement:
  • Disconnect wiring harness and mounting bolts.
  • Remove the alternator from the engine bay.

4. Battery Replacement (if necessary)

• If the battery is failing, replace it with a new one of the same specifications.
• Install the new battery by connecting the positive terminal first, followed by the negative terminal.

5. Reinstallation and Testing

• Reinstall the alternator (if removed) and reconnect all wiring.
• Reconnect the battery, ensuring tight connections.
• Start the engine and monitor the battery light; check voltage output from the alternator with the multimeter.