my truck died on the highway for no reason.I have no spark to the eng.what has h

has every single cylinder Lost Spark? If it is just half or one inspect the coils. and replace bad ones. if all of the Cylinders have no spark check your fuse box for blown fuse. indeed you found a blown fuse inspect all wiring. may be better off just giving a full tune up. As for for your question I don't know what you mean by H