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Alternator!!! Boost the car, if starts let it run for a few min. Once the car has stayed running for a couple of min, unhook the negative terminal on the battery, if it stays running, the battery is junk. If it dies, the alternator is junk. But this is just my past experience, and it worked.
Did you have the charging system and battery checked first before you started throwing parts at the car? Because I'm start to think that its in the wiring from the alternator to the battery (if the alternator was tested good). the symptoms are pointing to a bad alternator with the car not running after a jump. (the car is running off the battery which doesn't have much a charge and then it dies when the battery voltage drops too low). I would bet that your ignition wire to the alternator is bad (or signal wire) which tells the alternator the car is on and to start charging. I had a similar issue with my Honda and only a technician who rebuilt alternators was able to show me how to test it. Seems like you have a similar issue. Have the alternator and battery tested at any local Autozone and if they both test good I would start with the wiring as I suspect this is the issue you have. One of your alternator wires is the ignition wire which puts 12volts to the alternator (turning on the charging) to allows it to put out voltage to your battery.
I'm thinking its the battery. Heat kills batteries. You said it wont jump start. That's a dead ringer for a bad battery. It may have enough juice to power some things, but wont run the starter, or the fuel pump, or the ignition(spark). Try a new battery and let me know!
If you can put it on your self, the alternator could run from anywhere from $100.00-150.00 for a new alternator. Call your local auto part store and check the prices. It would cost alot more to take it in.
Check the harness for a break at the splice about one foot back of the alternator,it's a common area of failure.If thats not it then check the fusible link that comes from the starter relay and goes to the alternator.
When u try to start the engine, do the lights on the dash board turn off and come back when u release the key. If the do the battery connections are loose or the battery needs charge. If u start the engine and the lights don't turn off they stay lit something is wrong with the starter or the relay for the starter not working
keep in mind, your engine use both source of power to run, one from the battery and one form alternator. If the alternator is good, your engine should stay running regardless if the battery is good or bad, the alternator should keep the engine running. It sound like to me the alternator is faulty not charging your battery or keeping your engine running, even though the alternator is brand new does not mean is good. My guess I would take the alternator back and get another one. the reason why your car ran for 25 min and die it has no source of power to keep the sparks going although the alternator should keep the engine running and at the same time charging the battery but is not.
Sounds like your battery has gone south. If you can jump it to start and it continues to run then it is just running off the alternator. The battery can no longer store power. That is why you can't get it to start when you turn it off. It requires an alternate power source to crank the engine until the alternator kicks in to power the ignition. Have the battery load tested with a good carbon pyle load tester.
I am guessing that you put in a new battery drove it for a day at most and went out the next day and it wont start. Well if this is true then you will need an alternator, your battery is not being charged. Your car can start a run without this but you wouldn't get that far and eazy way to figure this out is either charge your battery or have a friend jump, be sure to let it charge for 3-5 min. before trying to start. If it starts than remove the jumper cables and let the car tun for another 2-3 min and turn it off. If you cant restart it than you will need a new alternator