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There is a charging design defect on Hyundai vehicles. Replace the alternator immediately as this defect may occur below 30,000 km of travel. Avoid using the USB charger while aircon, head lights, and radio are ON because the alternator ampere rating will get overloaded, and power will be drawn from the battery.
If your car is not cranking when you turn the key there are a few things you can do to pin point the problem.1) Make sure your battery connections are not loose and corrosion free.2) Make sure your starter connections arent loose 3) Make sure you did not leave any accesories on (headlights,interrior lights).If so and the battery is dead have the battery slow charged (try to avoid jump starts from a dead battery,its bad for the altenator).
Battery Dead ; Could you expand a bit more on your post. There is a couple of reasons/solutions to your problem . I'm wondering why you don't use your key for entry. Is there a cable problem or a latch malfunction? No power to a switch ( if equipped ) ? There are vehicles equipped with an emergency cable that can be pulled from inside the trunk that releases the latch to avoid being trapped inside.
That's probably caused by the key not being programmed properly for the car. If you just changed batteries, or the batteries are dead you need to reprogram the key for the car. Usually you do this to avoid getting in safe mode, but it may still work. Worth a try. Instructions: http://forums.audiworld.com/showthread.php?p=14741675
Yes it does-positive to positive first, negative to negative and you should try to hook the negative clamps to metal body parts instead of the battery to avoid sparks-like a bolt on the engines of each vehicle.
First, you need to determine why the battery went dead...put a volt meter across the battery terminals and verify that it is making above 13v and less than 14v while running. Also, the alternator is designed to maintain the state of charge in a battery, it will never fully charge it. To avoid overtaxing the alternator and shortening the live of the battery, always re-charge with a battery charger after needing a jump. (doing this about every two/three months will extend life of battery...makes up for time spent listening to radio etc with engine off)