So I have an 84 F150 and there's a wiring problem. The battery is fine, I even took a new one and put it in. The headlights, some light, other electrical things won't come on even with the key on. It won't start, it won't do anything. Hazards or anything. If you bypass it the truck will sound like its turning over. It won't even jump off. Any help? Suggestions? Diagnosis?