how to diagnose electrical problems in my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shock.
• Ensure the vehicle is parked on a level surface and the ignition is off.

2. Replace Blown Fuses

• Tools Required: Fuse puller or needle-nose pliers.
• Check the fuse box for any blown fuses identified during the inspection.
• Remove the blown fuses and replace them with new ones of the same amperage rating.

3. Repair or Replace Damaged Wiring

• Tools Required: Wire strippers, electrical tape, soldering iron (if necessary).
• Locate damaged wiring identified during the visual inspection.
• Cut out the damaged section and splice in new wire, ensuring connections are secure and insulated with electrical tape or heat-shrink tubing.

4. Clean Ground Connections

• Tools Required: Wire brush, socket set.
• Identify ground points that may be corroded or loose.
• Remove the bolts securing the ground connections and clean them with a wire brush.
• Reattach and tighten the connections to ensure a solid ground.

5. Battery Replacement (if necessary)

• Tools Required: Socket set.
• If the battery voltage is low (below 12.4 volts), consider replacing the battery.
• Disconnect the negative terminal first, followed by the positive terminal.
• Remove the battery and replace it with a new one, connecting the positive terminal first, then the negative terminal.