This could be a bad connection. First step is to clean your battery connections, then work your way through the wiring. Common places are the starter connections, and body ground connections.
SOURCE: 2002 sonata 2.4l battery dash light on. replaced alternator. Still not charging
I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it.
The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator.
The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.
Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only.
This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.
SOURCE: new battery and alternator. Battery still won't hold charge
Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.
SOURCE: installed new alternator and car battery still will not charge.
did you unhook the battery prior to installing the alternator
SOURCE: replaced the battery and the alternator in 2006 ford taurus
check the alternator fuse and grounding
SOURCE: i have charging system problem on my 2006 toyota
your battery could have a dead cell and still register 12 volts when not running,, if your getting 13.67 volts on the posts with the car running, the alt is fine,, but the battery is faulty,, take it and have it load checked, that way you can be sure it has the amperage that its supposed to have,
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