2008 f250
 

have a f250 2008 with dome light issue. when ever key is on the dome lights flash on and off all the time until key is off. have no other bells or light on. dont even hear a relay clicking. is there a built in fault that will do this, to tell the driver something. if i pull the fuse it stops and i can turn the dome lights on manually. tried disconnecting battery. no difference. any help would be greart