My husband got in his ford f150 1990 and went to turn the key and it was like there was nothing there. He figured He needed to replace ignition switch so he did that and still wont start. He put a new battery in it, still wont start. please help we are desperate, no money to pay for mechanic and we both need vehicles to get to work.

It could be the safety neutral switch (ignition switch located at the base of the steering column)..try putting it in neutral,reverse,drive then turn the key.could be a fuseable link blown thats connected to the battery cable,could be a starter solenoid,try jumping the solenoid with a screwdriver to see if the starter engages,if not then hit the starter with a hammer,either the bendix cover is rusted out(really typical with 1986-1991)and causing the starter to gum up with rust or oil or dirt so the bendix sticks down,the starter will not spin unless the bendix is up.,or the brushes are worn out and thats what hitting it with a hammer will do,loosen the brushes up enough to start working a little and then you will know if the starter really needs to be replaced.