2001 monte carlo ss electrical issue
 

I am having issues that started a month ago. 2001 monte ss, battery light on dash goes from dead to normal here and there. Also notice a clicking sound in fuse panel and daytime running lights flickering on and off as well as interior lights. Thought maybe battery so bought new one....same issue so bought new alternator and serpentine belt, same issue. Seems when car sitting in sun, I have issue but if cold, no issue...tonight car died and would turn over but no start....ughhh, some help please.

Steve