1985 f-150 NO POWER ANYWHERE!

My 1985 Ford F-150 6 cyl. manual with overdrive would not start when I turned on the key, moved moved the key to start...it suddenly did nothing and all the dash light went out. I assumed the battery was run down and then tried to start it with my 2010 Ford car.
It still would not start and all dash lights went out. I then put my battery charger on the battery and charged fully charged the battery. I then turned the key off and back on and the dash light went on, tried to start again and the same thing happened. After about 10/15 minutes, I tried again and still did not start. I waited another few minutes, turned the key on and jumped from the battery positive to the starter cable after the starter solenoid and the engine started. I ran it for a few minutes, and the backed it into the garage. The next day I again tried to start it and again, there was no power to the vehicle...no headlights, brake lights, dash light...nothing. I assumed the starter solenoid was burned out and replaced it. Still did the same thing. I replaced the fusible link on a yellow wire attached to the battery side of the starter solenoid. Still no power. HELP!

You've got a bad battery cable or dirty or loose battery cable connection somewhere.

Thank you Mechhound. I got your reply a bit late. I cleaned the bat. posts and cable ends two days ago when I finally decided it was a continuity problem, not the starter solenoid.