Replaced the external solenoid & starter & jumped the battery but engine wont even turn over, any ADVICE PLEASE

 

I have an '83 Ford Bronco w/an automatic transmission that had trouble starting and we thought it was either the starter or the battery but nothing worked. We had to connect a wire from the starter relay to the positive post on the battery to jump start it. We took it into the shop and they found out that was the neutral swictch on the transmission. When it had diffculty starting we just put it in neutral and it would work sometimes. But the shop fixed it and it starts all the time now.

 

I've had this too - it was the battery cable! It was corroded (I couldn't tell simply by looking) but when I wiggled it, it was wimpy feeling and saw then that it had corroded. Replaced it and POP, fired off as good as new.