1965 dart 270 convertible no electrical power

i found a similar problem on another post but didnt want to add my issue for fear of high jacking the othe post. my 270 is a low milage survivor and the wiring has not been modified. i checked continuities and voltage for the battery cables, the fusible link and the wire from the starter relay to the battery. everything checks out ok. i then replaced the starter relay and the ballast. the car still wont crank and the lights wont come on. the battery is new but just to double check i took the battery out and had it tested. the battery tested good. what am i overlooking. any help is appreciated