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Hello. Welcome to Just Answer. Please allow me to assist you. What you probably have going on here (with regard to the inoperative accessories) is a blown fuse in the engine compartment of under the dash on the left side. Jumping the battery can allow a surge of current to enter the fuse panels and cause the fuses to blow. With regard to the caiuse of the battery discharging, I suspect you have an electrical issue inside the damaged tailgate. If you need further assistance, or have any questions, please feel free to reply.