No power getting into car

My car 04 grand prix over heated really bad so i
changed the waterpump and thermostat and it
started down pouring in the middle of changing the
waterpump everything got soaked however it
started right up. When i parked it it never turned
over again. I changed the starter,ignition
module,battery,and nothing no power any where
except the battery,alternator,and starter no power
anwhere inside the car no
horn,dashlights,radio,nothing at all. Someone
please help me im a single father of a 6yr old boy
with autism and been without a vehicle for 4
months now and struggling terribly to get him to dr
appts,school,ect im out of ideas