My battery drains after driving car 2003 xj8. New battery but have to charge daily. Help

 

Welcome Smithauction, ...for simplicity purposes and from throwing crap at the wall to see what sticks. Take it to an AZ or O'Reilly's and get them to do a test on it to determine if it may be the alternator or alternator connection. Also, check your battery cables, if there is any corrosion visible, replace it. You'll never get it off enough to prevent its return and prevent power from being properly distributed. Do a Search for Battery Tender and you'll get plenty of threads to review regarding maintaining your battery (I heavily recommend a Battery Tender for any storage time over a week). Check your grounds for corrosion and for future reference save this to your favorites... JagRepair.com - Jaguar Repair Information Resource
Also, use this thread...https://www.jaguarforums.com/forum/x...k-links-20090/ ...its a Sticky at the top of the Forum.