Came on today the battery not charging light as well as the volt meter light and reads low prob.10 volt I got it home. Wondering is the volt regulator in the Alternator. or is there some easy fix before I start Throughing darts at this unfortunate problem. Thanks Jag owners and enthusiists.

 

I would point to either bad battery or alternator. The battery is the easiest to access so start with that one, and bring it to an auto parts store that can test it for free. If that's good, remove your alternator and test it at autozone or some place similar that does free testing

 

if you need more help after testing, go to the XK8/XKR forum. Lots of help there.