When i start the car the volt meter drops down to about 9 and then goes up to 12 but never goes over 12 even with a new battery. if i turn my lights on it drops slightly or anything that uses more power blinkers back up lights etc... i replaced the battery, alternator and starter now and i still does it and the battery will die after driving it awhile.

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

First put your battery on a slow charge 6-8 hrs.then check the batteries voltage it should have at least 12-12.8 volts if it does'nt then you need a new battery.If has 12 volts after its charged and goes dead after its installed in the car then you need a new alternato.

Check the battery like this:
Turn on the headlights, then try to start the car.
If the headlights do not dim or go out, then the battery is likely ok.
Check that the battery cable plus post, goes to the starter, Minus post to a good ground, like the engine.
If wiring is ok, then look at the starter solenoid for a good connection.
Problem is most likely the Solenoid or starting relay, whichever the car uses.
Hope this helps.

Tell us more details.
For example, how do you know the alternator really is good?
You say new "ignition", but that could be the ignition switch, plug wires, distributor, etc.
Regardless if the battery was new, you can easily drain the battery in less then 20 minutes, so we need to know if the battery still has a charge or not. Put a test light or volt meter across it.
We also need to know if it does nothing, not even drain the lights, or if it clicks at the solenoid?
The best would be if you put a voltmeter across the battery.
If the ignition switch is bad, then nothing at all with happen.
If the battery is bad, it will start around 12 volts, but drop down below 9 and not come back up when you stop trying.
It is drops but comes back up, it is probably the starter.
But you could try turning the engine over by hand on the alternator nut, because it could be seizing up from a bad bearing.
Try jump starting it also.
If that helps, then check the voltage when reved up.
It if does not reach over 13.5 volts, the alternator is not working.

Generally if charge light is on, alternator has a bad diode in it. This lets the charged battery lose its power by flowing in the reverse direction. It sounds as the alt., is either not connected right or is swtill bad

dear friend-the voltage that you are measuring is battery voltage and as soon as you try to start the vehicle it will drop to 9 volt which is not enought to start.if you remove the pos,battery clamp and put a test light between the pole and the terminal and and the light lites up then there is a draw running the battery flat.

sounds like a defective starter drive.

short or loose connection

Connect a volt meter to the neg. and pos. of the battery. Have an assistant start your car and watch to see how far the voltage drops. If it drops more than 2 volts, for example, hook up the meter, you should see 12 volts. By starting the car and it drops below 10 volts during start up, your starter is slowly going out. It taking more amperage to start it than normal.