2nd time this happened to me. My 02 Tahoe won't start, it just clicks when you try to crank it. Then it acts goofy and I can hear the fuel pump run and the engine like get ready to start up again without using the key. I have a new battery (maybe bad cell), or could it maybe be the altinater? After I jump it it seems fine (after I drive for a while). I do have an alarm with remote start on it, also a mp3 player, XM radio ,and GPS all hardwired in so there is a possibility of a drain or short. I was going to get the charging system and battery tested. Anyone else have any ideas?