One good thing, these early Ford systems are pretty basic. Ok, here is what the solenoid will look like electrically. There is the fat cable from battery to solenoid, another fat one from solenoid to starter, and at least one skinny wire coming into the small posts on the front of the solenoid. The way a solenoid works is it will not pass the main current until a voltage is applied to the small terminal.

So, if you have one of the small inexpensive test lights, first of all make sure you have 6 volts coming from the battery to the solenoid ( you may have to make a test light, as I think the ones you buy are all 12 volt) then turn your key to start or push the starter button and see if you have 6 volts coming to the small post on the solenoid. If you don't it will be a matter of backtracking until you find where the current is lost.

Don