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The starting system has nothing to do with the electronics, so don't waste your time looking at that.
The cabling from the battery goes directly to the starter mounted solenoid, and the cable from the starter relay on the fender is what triggers the starter solenoid. The starter relay is triggered by a 12V signal coming from the fuse box, thru the ignition switch and the clutch pedal position switch (manual tranny) or Transmission Range Sensor (auto tranny). That signal lands on the starter relay on the small wire.
Pull that off and if the starter still self cranks, then the problem is either in the starter relay or the starter itself. The starter relay is about 12 bucks, so wouldn't hurt too much to replace as a test, or you could just disconnect the output wire from the relay to the starter. Then if it still self cranks, the starter solenoid is the cuplrit.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here
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