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.
To replace the distributor cap on a 1989 Ford Bronco II, first disconnect the negative battery cable to ensure safety. Remove the distributor cap by unscrewing or unclipping it, then carefully label and detach the ignition wires from the old cap to avoid confusion when reconnecting. Install the new distributor cap by connecting the wires in the same order, ensuring a snug fit, and finally reattach the negative battery cable. Start the engine to confirm the installation was successful.
does your bronco have an external voltage regulator if so i would take it and have it checked
Dont start the car as you're connecting the cables -APEX
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.
A 1987 Ford Bronco may struggle to start in cold weather due to several factors, such as a weak battery, worn spark plugs, or old fuel. Cold temperatures can reduce battery efficiency, making it harder to crank the engine. Additionally, if the fuel is old or contains moisture, it may not ignite properly. Checking the battery's charge, replacing spark plugs, and ensuring fresh fuel can help resolve starting issues in cold weather.
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.
To replace the alternator in a 1989 Ford Bronco II, start by disconnecting the negative battery cable to ensure safety. Then, remove the serpentine belt by loosening the tensioner. Next, disconnect the wiring harness from the alternator and unbolt it from the engine. Install the new alternator by reversing the removal steps, ensuring all connections are secure before reconnecting the battery.