My 2000 XK8 doesn't get much use in the winter, but I do keep it on a trickle charger.
I thought to myself, on a constent charge the terminals would build up the same as they were being driven. So the lead powder would prevent a positive connection and full voltage flow.
Sure enough they were both a dull powder finish on the cable and terminal.
A battery terminal cleaner shinned them right up and I fell a lot better.
Last time I drove it I had full voltage but a couple of miles down the road I had the Christmas tree on the dash. Quick restart and all was good. I think this was the problem, Please be the problem. LOL

Wayne

 

I think a CTEK charger would either minimize or eliminate the problem. A couple of friends use them and don't have a problem.

 

I'd still put a scantool on it to check for codes.

Graham

 

I agree with RJ. CTEK is the way to go.

I had a similar problem. Take a look..... Franks XKR Story. - Page 349

You can follow my progress and the discussion that followed over the next few pages where I ended up buying this charger. You might find it enlightening.