I have an 1986 m1008.Most of the fuse box has no power.I have checked every fusible link that i can find under the hood and all have power on both sides.I have replaced every fuse in the fuse box.new head light switch.I have cleaned every ground that i can find on the truck.I have tried the black out switch.It has no power to it.I did replace a battery because it was cracked and leaking.I don't know much about the electric but I am learning alot.Let me know if anyone has an idea of what is wrong.