Classic/Antique Car Repair: battery not charging, ford fairlane, alternator output

Question
My daughter just bought a 66 Ford Fairlane Custom 500. We have put in a new battery,alternator and starting solenoid. Itwill run fine for awhile and then when you try to start it the battery needs jumped. What should I try next?

Answer
Now that you have spent a bunch of money trying things it is time to break out the voltmeter and test the alternator output, the voltage regulator, the battery cables and connections. It appears that the alternator is not charging or that if it is the output from it is not getting to the battery.
Brad