how to check the battery on a Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Tools Required: Multimeter, battery load tester, protective gloves, safety goggles.
• Ensure the vehicle is parked on a flat surface, and turn off the engine.
• Wear protective gloves and goggles to avoid any acid exposure.

2. Visual Inspection

• Open the hood and locate the battery.
• Inspect the battery terminals for any signs of corrosion (white powdery substance).
• Ensure the battery terminals are tightly connected and free from dirt.

3. Check Battery Voltage

• Set the multimeter to the DC voltage setting.
• Connect the red probe to the positive terminal and the black probe to the negative terminal.
• A healthy battery should read approximately 12.6 volts or higher. If below 12.4 volts, it may require charging.

4. Load Test

• Connect the battery load tester following the manufacturer's instructions.
• Apply a load equal to half the battery's CCA (Cold Cranking Amps) rating for 15 seconds.
• If the voltage drops below 9.6 volts during the test, the battery is weak and should be replaced.

5. Check Age of Battery

• Look for a date code stamped on the battery case, typically in the format of a letter followed by a number (e.g., A20 = January 2020).
• If the battery is older than three years, consider replacing it as a preventive measure.

6. Examine Charging System

• Start the engine and use the multimeter to check the alternator output by measuring the voltage at the battery terminals.
• A good alternator should produce between 13.7 to 14.7 volts while the engine is running. If not, the alternator may need repair or replacement.