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Thanks for posting
It's obvious that there is a direct short circuit to ground in the left turn signal circuit, next step is to find out if it's front or rear, start at the rear, unplug the rear light assembly from the car harness, check if the fuse still blows, the front may blink rapidly that is normal, if the fuse still blows do the same at the front turn signal disconnect it and re check, let me know the result of this. Thanks.