I don't have a Ford and I don't even have a car , the only reason I joined this is to help you .
when electric things go crazy like this , you must suspect a shorted together wires on the path of electricity that sends electricity to your unwanted load - dash lights - , also check your relays , if one is stuck open or closed .
I think your battery problem was a result , not a cause of your electricity problems
follow the path of dashboard lights on your workshop manual , it will make it easier
Tell me if I am correct , please
