Battery not charging with new battery and alternator.

head lights dimming is the clue
that indicates low current from the alternator and mthat will produce all of your problems
check belt condition and tension .Have an accredited auto electrician check the complete charge circuit and have him do a load test on the battery

Diagnosing Common Automotive Charging System Problems

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Sep 18, 2013 - Dim lights. ... Problem: Engine starts OK, but the battery does not stay charged. ... Solution #2: If the battery won't hold its charge and your engine stalls out,then it's time to ... Problem: The charge indicator light comes on while driving. .... It's OK if the wiring of the toggle switch goes to B+ or the alternator B+ ...

Alternator Problems -- Diagnosing Electrical Problems ...

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Jun 24, 2013 - Diagnosing alternator problems can be a bit tricky in certain ... After that, the alternator takes over. ... Your lights might begin to dim, you'll lose power, and then, the car ... be able to turn on the headlights, or they'll come on but very dimly. ... So before you go out and order a new battery or a new alternator, ...

What causes the battery light to be on? ' Mustang Forums at StangNet

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You need a new regulator, or you have a bad ground to your battery.

Good job, glad you got it.

have the alternator checked. if the alternator is not charging the vehicle is only supplied with what power is stored in the battery. once the battery is dead there is nothing to charge it

If the battery and alternator tested fine. I would have the charging system rechecked when engine is hot and at high rpm's. This way the checks are being done as if you were driving and driving for a long time. Alternators can work fine when cold but weaken when hot or stop working. This problem is not rare but only is seen occassionly. Unless it was checked at an electrical shop the average shop doesn't run these tests for they don't see the problem often enough to automaticly run them at all times. Good luck and let me know how you make out.

What is the voltage you are reading? Is it below 13.2 or so? Also have you checked the current with the engine off to see if something else is working that should not be on. I ran across this twice while working on a truck and car. A relay that was wore out keep trying to close and would drain the battery every couple of months. Sometimes you can hear them clicking or buzzing. Touching them sometimes they are warm or real hot. But that is not a sure sign it is bad. In my Trailblaze they get hot but are ok. Another thougth is the belt on your alt, correctly set to spin it at the right voltage. I have ran across this many times lately with serpatine belts.

the Alternator (this keeps the battery charged) is not charging the battery, the lights dim due to the battery voltage dropping low, go to any Kragen or Autozone and have the battery and the Alternator/generator tested, it is free.

maybe the alternator