1981 Nissan Datsun 1600 Fairlady - Won't start

1981 Datsun 720 truck will not start. I had the battery checked and it is good. Lights, radio, etc will not work. Where do I start trouble shooting? tks Dan

Check the battery cables and ground strap. If you do not own a volt-ohm meter, buy one before you start. Resistance should be nearly zero to ground and you should see battery voltage at the end of the positive cable at the starter. When you get the lights on, try to crank it and post back.