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Besides cleaning the battery ground terminal, an equally important connection is where the ground cable attaches to the frame. It is out of sight and out of mind. This is probably the most neglected electrical connection on a Model A Ford.
Remove the floor boards and the battery. Disconnect the cable from the frame and clean all the rust, corrosion, crud, paint, and powder coating from the raised boss on the cross member until there is bare metal. Wire wheel the end of the cable and the nut and bolt. You need to do this at least every ten years.
A poor connection at the frame can cause dim headlights, difficulty in starting, and could allow the generator to run wild if the connection is bad enough.
Tom Endy