My 02's battery died after a couple of weeks of sitting while I was on the road working. I haven't owned it but a little over a year. I replaced the battery because I didn't know its age. It will stay charged most of the time if driven daily. The lights keep switching on their own between the daytime running lights and the headlights. The dash lights and radio keep dimming accordingly. You can hear a relay clicking when this happens. Something is staying activated killing the battery. The battery and charging system checks out. I hope both of the issues are related. I haven't had any luck figuring it out, any help will be greatly appreciated!