Charging system goes from 14.4 volts to 11 volts intermittantly

Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

If the battery is not being properly charged while unit is running, it will go dead. You may have a problem with the voltage regulator or magneto causing the no charge issue

How many mile are on you vehicle ? Have you ever had Alternator replaced before ? You alternator maybe starting to fail , brushes or the voltage regulator .
Charging System Indicators
BATTERY The IPC illuminates the battery indicator when the following occurs:
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The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.

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The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.

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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

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The ignition is on, with the engine off.
BATTERY NOT CHARGING The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
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The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.

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The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage

It would be a good idea to have it checked out , most auto parts stores will do this for free !

amps or volts
11 to 12 amps indicates nothing but if it is volts then it indicates that the alternator is not charging the battery
Battery voltage is 12 -13.5 volts and when charging is 14.5-14.8 volts dc
the rest of your statement indicates that the alternator or voltage regulator is faulty and you should have the charging system checked by an accredited auto electrician

it may have deffective diode on the charging system(the alternator). 14 volts is an over charge in a battery. ampere reading must be on what the battery designed.

Hello
The normal charge of alternator on idling is about 13 to 14 volts. 12 is acceptable but keep in mind it will need attention soon. The needle fluctuates due to the revs of the alternator - there is nothing to worry about. Just look that the charge is always above 12V on idle.

have a battery load tested
battery should be 12.5-13.5 volts at rest and no lower than 11 volts while cranking
next have an auto electrician to a charging system check
check that the drive belt is in good condition and tensioned properly

I would have both checked out, have someone test both with a Volt Meter, your alternator should be putting out 13 to 14 volts when your engine is running and your battery should be at 11 to 12 volts when it is checked with the engine off, any less on those two numbers and I would replace either or. AutoZone will check your battery and charging system for free if you stop by.

Take apart the dash. Jiggle the connector while the car is running (be careful, only 12-14 DC volts, won't kill you but you'll get a shock) and see if it goes in and out.

Perfectly normal.
Starting with the 2005 model year, light duty full size pickups and utilities are equipped with a new Regulated Voltage Control (RVC) system. This system reduces the targeted output of the generator to 12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy. The generator may exit "Fuel Economy Mode" if additional voltage is required. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation and NO repairs should be attempted.