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Hello. Is the key on or off when the fuse blows?
And I need to know the year of your beetle.
Most common issues are the ignition switch. Let me know the year of your beetle too
Also try this first. Unplug all ignition coils and see if the fuse now blows. If it does NOT then you have faulty ignition coil or coils. They are extremely common to fail. Let me know if this helps. I will do my best. Lou