ford man too

Hi i have a 1995 5.0 mustang. The car overheated yesterday and i replaced the water pump and thermostat. today i filled the car with fluid an ran it for a while an it ran fine. i took it for a ride an it overheated i blew my bottom radiator hose. i immedietly took the car home to let it cool. i fixed the hose an went to start the car an this happened now heres the problem without a key in the ignition the box by the over flow tank clicks an so does my injectors. when i try to start the car i have nothing no clicks or anything. i unhooked the ground cable and re attached it. it started clicking again with no keys in the ignition any help would be appreciated this has me completely stumped