What is inside a battery ? Rocky_B - See my entry here for more things you might want to check: http://wiki.answers.com/Q/What_could_be_wrong_if_the_battery_light_stays_on_and_the_battery_still_runs_down_on_a_1996_windstar_after_installing_a_new_battery_and_alternator
the bronco needs to have the ground wire connected from the battery to the body. if you replaced the battery and disconnected that ground it simply won't start.
battery hooked up backward, wires crossed somewhere or it could be the solenoid.
it could be the control module
does your bronco have an external voltage regulator if so i would take it and have it checked
I replaced the drivers door switch on mine and it took care of the problem
There is the FULL SIZE BRONCO and then the Bronco II ( the Bronco II is smaller , eventually replaced by the Ford Explorer)
Are you sure the battery has enough juice (13.5volts)? Is the engine locked up? Try turning the motor by hand. If the engine is not seized, take the starter off and bench test it. Recheck your negative battery cable, a very good chance your problem lies there. The same thing happened to my 1995 full size bronco today. I took the battery cables off cleaned each one, and still the same problem. I replaced the starter, solenoid, finally noticed my ground wire from my intake to the fire wall was charred. So I checked my lower battery cable connections and my ground was not connected. I replaced my firewall ground and replaced my battery ground wire and all my problems were solved. Even my dash readings were fixed, I always had crazy readings on my dash (temp, oil pressure and amp gauge) all were fixed with the installation of my new ground wires.
I had the same problem and it was a bad starter.
The Bronco II was made till 1990. The it was replaced by the Explorer in 1991.
My 91 Bronco did the same thing before I found a crack in the passenger side exhaust manifold. Replaced with 50 state smog legle headers and a new O2 sensor and fixed the problem.
Defective electronic control module.or maybe starter
Under the hood, behind the battery