How do you jumpstart a jaguar xj6?

To jumpstart a Jaguar XJ6, first ensure both vehicles are turned off. Connect the positive (red) jumper cable to the positive terminal of the dead battery and the other end to the positive terminal of the working battery. Then, connect the negative (black) jumper cable to the negative terminal of the working battery and attach the other end to a grounded metal point on the Jaguar, avoiding the negative terminal of the dead battery. Start the working vehicle, let it run for a few minutes, then attempt to start the Jaguar.