my brother in law called his 85 f250 that i sold him about a year ago just quite. he said he just suddenly lost power to everything, lights, radio, wipers all except his 4 ways. he says nothing else even tries to come on, thats a good one the only thing i could tell him is battery cables. is there a main fuse that could blow leaving the main fuse block dead he says the fuses are fine? any help would be appreciated i feel bad for him.