I can start and drive this car with no problems, as long as I start it under the hood using leads.
With the key in the ignition, it makes no sound when attempting to turn over the engine. We have replaced the battery, twice. Which implies something might be draining the battery? But, I have no idea.
I hired a Jag mechanic to find out and fix the problem. He changed the relays, the battery and then a module/censor of some type, and finally spent another two days trying to find the problem with no luck. He believes it might be electrical, but has not diagnosed the issue, since he does not have the right equipment to check it properly.