Hello. I have a 98 Discovery (210,000 km). A few days ago I went to start it in the morning and the battery was almost fully drained. All I got was dim dashboard lights and a ticking relay with the key in the second position (nothing happened in the start position). After jumping the vehicle everything ran normally (the battery charged) and I was able to use it for the whole day. The next day... same thing. Now I have been unplugging the negative lead every night so I don't have a drained battery every morning! Any ideas?