New alt and battery but still won`t stay running. will not charge. once the volt meter get below 9 it quits. any glue on what it can be. please let me know

Try this! Hook up a volt meter to the battery while its running. the voltage when running should be at least 14.0 or a little higher. when car is off, battery voltage should be 13 volts at least. if not 14 volts or higher while running, there has to be a break from alt, or a bad ground to battery or the gauge is wacky. God-Bless you and your family.

Volts slowly drop to where what quits ,The vehicle stops running ? Is the charge indicator light lit on the instrument cluster /? are any lights lit on the instrument cluster ? The instrument panel cluster (IPC) illuminates the charge indicator and the BATTERY NOT CHARGING message is displayed in the message center when the following occurs:
The engine control module (ECM)/powertrain control module (PCM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the ECM/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 serial data 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

Ya, when the car is running, you're using power from the alternator. So it will show 14 volts as long as its running. The fact that it won't hold the charge means the battery is shot and you probably need a new one

Once you have the engine running, place a volt meter across the battery and measure the voltage while you run the engine at about 2000 rpm. The volt meter should read in the region of 14.5 volts. If it is below 14 volts your alternator is not charging and needs attention. Also, after the battery has been used for a while and you switch the lights on, they should brighten slightly as you rev the engine, if they do not, the alternator is definitely not working.

If the battery/charging system light was tripped by the computer, it will take a obd2 scanner to turn it off.Keep in mind that the light indicates a problem with the charging system and not the battery in specific.
A volt meter place on the positive and neg battery terminals with engine running will give you the output reading for the alternator. The charging voltage should be between 13.6 to 14.2 volts. Keep this in mind, the lower the voltage, the higher the amperage going into the battery. So, if the charge rate is 15 Volts, There are o amps and the voltage without the amps Will fry the battery and the excess voltage can damage other accessories as we as lighting.Good Luck. If need arises I'm here. Ned

Altenator good? Did you bother to check the diode in the altenator? If its blown it will not let the voltage regulator charge the battery. The only way to check this on the engine is to have it running. Take a volt meter and check the voltage while running. If 13.5 volts shows it may seem to be charging the battery right? Maybe not. That the probes from the volt meter and invert the probes from red to the negative battery terminal and the black probe and connect it to the positive terminal. While running if the same voltage shows the diode is bad. The diode prevents the current running in reverse. If running both ways no charge is getting to the battery

start engine unhook positive cable if it dies its bad alternator or fuesable link between batt and alternator also a volt meter will tell u if its charging a good alternator will charge 13.50 to 14 volts

Have you checked to see if the alternator is charging ? Run a volt meter on the battery with the engine running, have to have more than 14 volts. If 13 or less, then replace the alt.

did you replace these things because the engine was turning over slower then normal?
or no turning over at all?
or turning over but wouldn't start?

take volt meter check voltage on batt.while truck is idling,voltage should be between 13.5-14.5v,turn headlights on it should stay in that range if it goes below,check for bad wire connection at alt.,if conn. are ok,theres a good chance alt. not charging properly!before doing test make sure batt.is full charge!