Yes, headlights drain battery power, but it is only major if you leave them on when you turn the car off, because the car might not start up after a bit.
Headlights should not be left on while the vehicle is not in use. If you are not driving, you will just drain your battery while having your headlights on.
Battery drain would depend on what else is on, for example headlights, courtesy lights, glove box light etcetra. If there is nothing electrical on then there should be no drain.
The new alternator is bad happens all the time.
If your electrical system is working as it should, using your headlights will not drain the battery. Of course that is assuming your engine is running. More than likely your alternator is not putting out enough voltage to keep the battery charged with the headlights on. Take your car to a trusted mechanic or auto parts store and have your charging system checked. You may need a new alternator. A loose drive belt can also cause this so make sure the belt is in good working order and adjusted correctly.
because the battery is the source of the power for the headlights. there could be an issue with the battery or the alternator can be failing.
Have a local auto parts store test the battery and the charging system. They will do this free of charge.
No, a bad coil will not drain the battery.
No. The power to illuminate the Daytime Running Lights (DRL's) is supplied by the alternator, and does not have to be supplied by the battery. Once a vehicle is started and the engine is running you could remove the battery from the car entirely and everything requiring current would still operate.
leaving your lights on for a long period of time.. headlights or just playing the radio and leaving it play for a long time
a flat battery
No, headlights do not consume gas as a source of energy. Headlights are powered by electricity from the car's battery.
Yes you sure can. It is a myth that sitting a battery on concrete will drain the battery. It will not drain it at all.