Car not starting

Im having this same problem with my 67 cuda right now. I pulled the starter and had it tested and it worked fine. Battery is good, new relay. When I jump relay it just clicks, turn the key and it just clicks. Tried to hook up a booster pack incase the battery was bad and still the same clicking. All the battery wires look good. Should I tried to put a clamp on ground on the starter? It worked fine one day and next time I went to start it, just clicking.

EDIT: Fixed it. I have 2 wires running to a switch on this junk Hurst shifter and one of them came off and didnt know it. Started right up.