how to troubleshoot Volkswagen Golf Seventh Generation (2013-2020) electrical issues

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked in a safe area with the engine off.
• Disconnect the battery to prevent electrical shock or short circuits.

2. Battery Inspection and Testing

• Sub-steps:
  1. Remove the battery terminals (negative first, then positive).
  2. Clean any corrosion from the battery posts and terminals using a wire brush.
  3. Test the battery voltage with a multimeter; it should read around 12.6 volts when fully charged.
  4. If the voltage is below 12.4 volts, consider charging or replacing the battery.

3. Fuse and Relay Check

• Sub-steps:
  1. Locate the fuse box (usually found under the dashboard or hood).
  2. Remove and inspect each fuse for continuity; replace any that are blown.
  3. Check relays for proper operation by swapping them with similar ones in the fuse box.

4. Ground Connections and Wiring Inspection

• Sub-steps:
  1. Visually inspect ground connections located near the battery and engine block.
  2. Ensure all ground connections are clean, tight, and free from corrosion.
  3. Check the wiring harness for any visible damage or fraying; repair or replace as necessary.

5. Alternator Testing

• Sub-steps:
  1. Reconnect the battery terminals (positive first, then negative).
  2. Start the engine and use a multimeter to measure voltage at the battery; it should read between 13.8 to 14.5 volts.
  3. If the voltage is lower than this range, the alternator may need to be replaced.

6. Ignition Switch and Starter Inspection

• Sub-steps:
  1. Check the ignition switch for proper function; ensure it turns smoothly without resistance.
  2. Test the starter motor by applying direct voltage to it; if it does not engage, it may need replacement.
  3. Reassemble all components after testing.