I have a dodge caravan 2002 it wont charge put on new alternator, and computer. it still wont charge. the wire on the back of the alternator is not showing any fire?

Most likely the voltage regulator has dropped out of service/gone bad. The computer compensated for a bit, but it wasn't the computer to begin with. Change the inboard voltage regulator inside the alternator. Get one fron any auto parts outlet. It's cheaper to do it this way, but is you don't feel like getting your hands dirty, take it to a shop and have them change the alternator for you.

most likely throttle pos sencor

I have pasted your schematic below. With all new parts, the likely problem is with the wiring. If the car runs OK, the wire with the orange stripe is probably fine. So then you need to check the green wire to the computer for good continuity. Then check the black battery wire and fuse. Finally, check the ground wires. You might try connecting jumper cables directly from the battery to the alternator and turning the lights on to see if good connections make a difference. If they do, then take one off at a time to see which one is the problem (positive or negative).

if alternator tested fine the wire on the back of the alternator is not getting a circuit back to the battery to charge it.
You can run a wire from the back of the alternator to the battery positive post and it will charge the battery.
I have done that several times on dodges because of ammeter gauge in dash being burnt out.
With the ammeter gauge burnt out it breaks the circuit from the alternator to the battery and the battery does not get charged.

did u put the belt back on

My 2003 dodge caravan would not start after driving about 1/2 hour. I stopped for coffee and when got back in to start it started I switched gears and it stalled. I tried to start again switched gears then it started but only for 2 sec. No clicking, no cranking sound just would not start but battery functions were great. Spent 2 days with a mechanic who could not resolve so sent to Dodge. After a day of putting wires back and checking out the problem they said it was the computer. Said that it was bad and could be replaced at no charge due to malfunction. Yes, it worked fine afterwards no more problems. They also said that some of the computers are found to be defective like this one so I hope this helps you in the right choice to have the dealer check it out if you are unable to get a computer reading and there is no obvious short in the system. Free sounded very good but as you know there is no such thing as really free as they got me for other things $350 worth. ouch!

The computer has NOTHING to do with the alternator output.
The alternator is self regulating, with diodes, and rectifiers.
If the alternator is over charging it is because your battery is not accepting the charge, so the charger works harder and produces more to charge it, up to a point.
Was the alternator that you installed new or rebuilt ?
It could be another bad alternator.
Please let me know.

remove the negative battery cable from the battery. loosen the serpentine belt by using an open-end box wrench and pull the tension pulley back (it's spring loaded, so be careful) by the bolt, remove the belt from the alternator and the tension pulley, then slowly let the tension pulley loose. remove the nuts holding the wires on to the alternator. remove the bolts from the alternator mount, and remove the alternator. put the new one on and hand tighten all of the bolts. then tighten them down with a wrench. put the belt back on the alternator pulley and make sure it's on all of the other pulleys and wheels except the tension. use the wrench again and pull the pulley towards you with your right hand and put the belt under the pulley with your left, and let the pulley go back. reconnect the wires to the alternator and then the battery. **warning** make sure that the battery is fully charged before you start the car with the new alternator, or you'll cause "alternator death" and void your warranty.

Could have a problem in the signal wire to the light. May be shorted. If you had alternator checked and new battery that is about the only other thing it could be. Otherwise it has to be a problem with the charging system like still the alternator.

if you can get the car started while it is running take the positive side of the battery cable off if it dies then it is the alternator if it does not die check the drive belt to see if it is loose or slipping