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Either the alternator is not being energized with the key on, or the main wire from the alternator to the battery/starter is bad.
Have you checked output on the back of the alternator with the engine running ?
It is not charging the battery because of several problems ---1 when connecting up the wires to the alternator was there a spark at the connection ---2 is the heavy wire on the alternator insulated from the body of the alternator--- is there a fuse in the charge circuit that is blown---4 is the light wires pushed fully home in the connection--- have you the correct alternator for the car ( internal or external voltage regulator)---5 is the drive belt in good condition and tight- If everything checks out then take it to an accredited auto electrician to have the alternator tested properly as new alternators ( out of the box new) can be faulty.
Have the charging system checked. Maybe the new alternator isn't charging. Is your battery light on when running? If you put a voltmeter across the battery terminals when engine is running, you will know if alternator is working or not. You first should have the battery charged up. Voltage should read at least 13.5 volts, engine idling. If you just get battery voltage, say 12.6 volts, alternator is not working:. Check all battery and alternator connections for a clean, tight connection. Battery cables and connections should be inspected. Check for any blown fuses, your truck may have fusible links- if any are bad, you need to replace them. They would be located close to the battery, as they serve as power distributors. Good luck.
CHECK BATTERY VOLTAGE WITH TRUCK IDLING.SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR NOT CHARGING BATTERY.IF ALTERNATOR NOT WORKING TO KEEP BATTERY CHARGE.THE TRUCK WONT RUN RIGHT.YOU PCM,CANT FUNCTION AND CONTROL ALL THE ENGINE CONTROL SYSTEMS.YOUR FUEL SYSTEM , SPARK SYSTEM NOT GOING TO WORK IF BATTERY DONT HAVE POWER AND ALTERNATOR NOT WORKING. CHECK ALTERNATOR POWER FEED WIRE AND VOLTAGE REGULATOR WIRES AND CHECK ALTERNATOR FUSE.MAKE SURE ALTERNATOR GETTING GOOD 12.6 VOLTS FROM BATTERY.MAKE SURE BATTERY FEED WIRE NOT BROKEN.
IF YOU CHECK FUSE.BATTERY CABLES COULD BE FAULTY IF VERY OLD.THEY CAUSE HIGH RESISTANCE IN CHARGING CIRCUIT.CHECK FOR LOOSE DRIVE BELT.AND CHECK ALTERNATOR WIRING IF BROKEN OR DAMAGE YOU WONT GET CHARGED.AND MOST OF ALL MAKE SURE YOU BOUGHT THE RIGHT AMP ALTERNATOR.
If you have a fully charged battery when you installed then 14 volts is way to much charge for the battery which would mean that the alternator probably has a faulty regulator and the alternator needs to be changed otherwise you will continue to install new batteries. If the battery was in an uncharged state then it is possible for the alternator to charge at full capacity to charge up the battery.