My alternator went out so i replaced and its working fine but my battery still keeps dying its not takin the charge from the alternator and when i charge the battery it will start and drive some distance but it will only go bout 15 mph occasionally speed up then decrease again like a misfire of some sort. loss of power

so you replaced it with wrong alt. how fun that.?
but what is wrong I bet is thjis
not doing step1.
S1: remove battery neg lug first.
s1a if not dont the you blew up the huge alternator main fuse
connected to the huge alternator stud wire. boom its blow up
and 100000 new alternators fail and there are more fuses too.
check them all ,skip none, that means too FUSEABLE LINKS
and do not let clerks tell you what to do. they are NOT TECHS.
find out what the truck needs first
even here is clear

sadly the SM tells this,. yup used 4 types of ALT here.

1. Rear Terminal, External Regulator, External Fan Alternator
2. Side Terminal, Internal Regulator, External Fan Alternator
3. Leece-Neville 165 Ampere Alternator
4. Integral Rear Mount Regulator, Internal Fan Alternator

lost the old OEM working (before) alternator I hope not. did you?
this is one schem./

Link "J) blow if battery lug not pulled first NEG lug.
has internal regulator here. no ECU override on 5.0


hard to find truth here, the books do not cover all 4 ways.
some ALTs are born dead with charge lamp burned out.
so make sure it is not. (called self excitation path)

Are you saying it died because of battery or charging system? I've seen info that says generator rebuilders have a tough time with rebuilding ford generators. It's not uncommon for them to be faulty right out of the box. What testing have you done on your battery and charging system? Any applicable trouble codes? The problem might be something unrelated to battery and charging system. I mentioned the generator because you mentioned it.

Maybe it wasn't running long enough to charge up the battery?
Stop trying to jump it, when you are having problems with it dying, take the battery off and have it charged. And/or buy a $20 voltmeter to see what the battery shows. If it says less than 12 volts, it is discharged, and needs charging. A good battery that is not run down should have at least 12.5 volts. A new battery that is charged should have very close to 13 volts, maybe 12.8 volts.
When you have the truck running, check the alternator for charging. You put the voltmeter right on the battery and check it again. This time, with truck running, battery should show at least 13.5 volts. That shows the alternator is working. A good alternator will put out about 13 or 14 volts-the regulator will keep it from going any higher to prevent problems, like a melting battery or electrical parts burning out.
I would say get the charging system working right, then address the problem of dying at stop lights. That could be a carburetor problem, if the alternator is working.

This is easy to test but you need a multimeter. Connect the multimeter to the battery and run the engine at a fast idle (say 2000 rpm). You should get a voltage reading anywhere from 14 to 15 volts if the battery is fully charged and the alternator is working. If the reading is around 12 volts, then the alternator is not working.

Sounds like a bad alternator. A fuse is either good, or bad, not works, then don't.

Sounds to me like your alternator is still defective. You don't need a good battery to run a car. Start car and remove (carefully...do not allow it to touch any metal), negative battery cable. If car dies it is the alternator. If it runs then the battery is bad. Hope this helps.

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sounds like you might have blown the fuse for the alternator or the wires for the alternator are dirty loose and not charging the battery right

The alternator is what charges the battery, most likely there is a bad connection at or to the battery, or the alternator has quit working and you will need to replace the alternator.

if your battery died while driving and the car cut off while your driving,, your problem is from your alternator!!!,, on a normal working car, you can start, remove ther battery terminals and the car would still run cause the alternator will be powering the car. In your case the alternator isnt working and the car was working on battery power therefore when the battery went dead the car cut off.. Your alternator need \s to be charging between 13.5 and 14.2 volts.. as little as 10 volts will keep the vehicle running.. I'd suggest you have the alternator replaced.

Your alternator died. You drove until your battery died also. You need a new alternator and a new battery. You might be able to get away with just charging your battery. Do Not jump start the vehicle and let the new alternator try to charge the old battery! Take the battery to a service station for testing and a charge. Install the new alternator and then install the charged battery not vice versa and you'll be fine.