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Fuse #4 in the under-hood fuse box protects the front corner marker lights, rear taillights, and license plate light(s). It does not supply power to the accessory socket. The reason the fuse keeps blowing is the red/black wire from the taillight relay is grounded(shorted) somewhere after the relay. The relay won't cause the fuse to blow. Somewhere the red/black wire is touching a bare metal surface or a wire that is grounded.
Has the car been in an accident? Do you have a trailer light wiring converter? Any damaged or repaired wiring harnesses? 2-door or 4-door?