No power motor will not crank ,no lights no
Start with the battery. Make sure it is at a full state of charge, at least 12.6 volts on a voltmeter. If it is under 12 volts have it charged, or if battery is over 4 years old, best to replace it.
With a good battery, clean all battery connections. Get rid of all corrosion so you have a clean metal to metal contact. A solution of water and baking soda helps a lot. Replace questionable battery cables. Then get a good tight fit on all cables, battery, starter, and ground.
Now if you still have no power to anything, lights, or switch, horn, anything...then you will have to find the fusible links just off the battery that distribute power to the head light switch, to the key switch, to parts of the fuse panel, etc. If fusible links blow, they can be cut out and replaced. They act like fuses, designed to burn out to protect the rest of the circuit from burning up from a short or amperage surge from a shorted electric motor. Once you get power to the lights and the key switch, you should be good. Go from there.
1981 Ford F 150
on Oct 21, 2013