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Hi the Jaguar XJ6 works off a 12volt, negative earth.... Jauguar are a legend for electrical faults.... ok you need to do a voltage check/fault check on the system, remove the fuses from the associated problems, i.e the rear lights! place a volt metre over the contacts and there should be no voltage present! grab the wiring harness and move it side to side! if you see a rise in the volt metre then there is a short to the earth! this can be done through out the systen including switches.... i would personally check the earth contacts near he problem areas these corrode and you then get a short in the cicuit
Does your dash light up to indicate you have a battery source or power? If yes you have power try starting it in neuatral or in another gear. If it starts in neatrual maybe your selector going bad. If it starts in other gears repair the shift selector. Three If no power indicated check fuses. four will motor crank or turn over if yes look for a drivability problem. If no final maybe bad ignition switch. Need to replace ignition switch. Probably time for service