about 2 weeks ago my 5.0 wouldnt start.. so i replaced the starter and i figured while i was doing that i might as well replace the battery cause its a fairly new car to me and the battery was looking pretty old.. so this fixed my problem.. and i havnt had another problem until this morning when i went to start it and it wouldnt even crank.. i wasnt getting and electrical signals.. so now im thinkin the alternator may be the problem.. how would u go about checking to see if the aternator is bad?