Re: dead bronco needs YOUR help
Okay, Roland, if it's still dead after you tried Bravomans good suggestions:
By chance did you disconnect the ground wire from negative battery over to the fender, and not re-connect it?
The low-current control part of the start circuit is from 12 volts, through a fuse somewhere, thru Ignition Switch, thru Clutch Switch (if manual!), thru Trans. Switch, out a thin wire over to the Starter Relay on the Pass. side fender (its the wire by itself, with a boot on it).
The wire with the boot puts 12 volts on the relay coil. The other end of the relay coil is connected internally to the relay's metal mounting plate. That's how the relay coil picks up its ground, thru the fender. Try running a jumper from the metal plate to Negative Battery and try to start.
When the relay pulls, it connects the two bigger stud terminals together, to put battery down to the starter's solenoid.
Just putting a big screwdriver across the two big studs (don't let it touch the fender, and trans in PARK or Neutral with BRAKE ON!) should kick in the starter, as you and the screwdriver will act as the control switch, relay, etc.
Let us know how you make out! UncleDon