have a 93 f150 5.0 liter. I started the truck ,drove it all fine.but when I parked and turned off key the starter was going ,had to disconnect battery to make it stop.now when I start the truck almost always the starter keeps going even when I turn key off.I replaced the ignition module, still does it. had the starter tested and they said it was good.(starter has less than 1000 miles on it.) any ideas?? thanks....dave