your starter might be stuck on
I had the same problem and it was a bad starter.
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.
Check you connections make sure there on the correct way.
Dont start the car as you're connecting the cables -APEX
does your bronco have an external voltage regulator if so i would take it and have it checked
it could be the control module
Your battery is being drained by a short to ground ,SOMEWHERE. Easiest way to find this out for sure , without a test meter, is to disconnect the Positive battery terminal when you shut down engine. Then see if it starts the next day.
You can attach a motor to a battery by connecting the positive terminal of the battery to the positive terminal of the motor using a wire, and connecting the negative terminal of the battery to the negative terminal of the motor. This will allow the motor to receive power from the battery and start spinning when turned on.
If the battery is fully charged and the starter is working properly it will turn over and start. The alternators sole purpose is to supply voltage to the vehicle and battery when the engine is running. When the engine is not running the alternator has nothing to do with starting the engine. If the alternator went bad and the battery was discharged then you will have to charge the battery before it will be able to start the engine. Do not jump start the engine with a dead battery if you can avoid it. This puts a strain on the alternator trying to recharge a dead battery and can damage the alternator, even a new one.
Yes, you can start diesel engine even if you don't have battery in!
Start the engine up. The engine will rotate the pulley on the alternator and charge the battery.
Dead battery Fully charge or replace Dead battery Fully charge or replace Dead battery Fully charge or replace