i have a 2001 intrepid that would not start replaced battery with new one everything was all good for about 3 weeks. Then would not start again. Now when i turn the key i get nothing and everything goes dark no lights anywhere. when i jump it it starts right up and works fine til i shut it off. thought it was bad connection ended up replacing the negative terminal which didnt tighten up to well. that worked for about a week now same problem again. when everything goes dark i reached under and wiggled battery cables and lights come back but when try to start all dark again. ????????????

 

I would replace both positive & negative battery cables. I ran into this before with my 2000 Concorde I had.