Something recently gave out on my pathfinder. After wheeling on sunday we stopped at a wendys for some food. We are about to leave and I go to start my pathfinder.... nothing... just rapid clicking coming from the fuse box area. I thought it might of been the starter, but one of my friends said battery. We jump it and it starts up after a few tries.
Today i'm going to leave for class, and it predictibly won't start. A mechanicly inclined friend came by later and we jumped it and it started fine. He said to check the battery (i'll do that tommorow) and then if thats fine, the alternator.
So, is this diagnosis correct or is it something else? Also, how much should I expect to spend on a battery or alternator? I'm kinda broke at the moment, so i'd rather not spend a whole lot of money. However, I need a car for work (if I ever get any) so I have a bit of a problem here.