The alternator - it provides a charge to the battery while the engine is running.
You cannot charge a battery without a battery charger or having it charged by the alternator in your vehicle while it is running.
If you are sitting behind the wheel of a running vehicle you are considered to be 'in control' of that vehicle whether or not anyone ovserved you drive it or move it. You will be charged with "Operating While On Suspension."
Yes. A battery can be charged while in the vehicle.
Yes
A vehicle alternator keeps the battery charged It allows you to use the vehicle accesories while driving ( headlights , radio , etcetera )
If you can get your vehicle started you can then un hook the battery while it is running and if your vehicle stays running then your alternator is good. If it stalls and dies as soon as you unhook the battery then the alternator is not good.If you can get your vehicle started you can then un hook the battery while it is running and if your vehicle stays running then your alternator is good. If it stalls and dies as soon as you unhook the battery then the alternator is not good.
Yes. The alternator is used to keep the battery charged, while using the headlights, radio, a/c, etc. The starter to me is misstated because it actually cranks the engine. The ignition system starts it, and keeps it running.
If it is your voltmeter that drops while the vehicle is running. Most likely the alternator isn't putting out enough volts.
That would depend on the attitude of the charging attorney. They would both likely be arrested while the car, bag and other evidence was processed to determine the possession or ownership.
Yes it is possible that you can be charged with a DUI while just in your car. Depends on the laws of that state as to whether or not there is "intent to operate" a motor vehicle. Usually that means that keys are in the ignition or that the car is running.
With a fully charged battery (12.68 v) and the vehicle running, you should have aprox 14.2 volts at the battery connections. Do not disconnect the battery while engine is running, damage to the alternator can occur. If I read your question correctly, it sounds like the alternator is at fault.
While it might not be illegal in some places to lock a running vehicle, you may find that having a car running with keys in the ignition and no driver to care for the vehicle would invalidate your insurance as the vehicle was NOT secured. By not having insurance, the law is broken anyway.