my friend has a 2000 mustang and one head light stoped workin so i pulled fuses and put back in and it works. but the fogs dont work is there a foglight fuse somewhere? the switch still lights up? also the door locks have been acting wierd sometimes they lock and sometimes they dont. the work on an on with the transmister and the buttons inside. is there fuse to them? could the link be bad? what could cause this?