You said you attached only the battery cable and the cable going to the starter, and it cranked over. If that's true, you got a bad solenoid. There is nothing else involved at that point.
The battery cable attached to one solenoid post, and the starter cable attached to the other, the only way power can go from one to the other is if the solenoid closes, and it can't without another voltage source and a ground. The solenoid is bad.
Take care,
~Chris
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