Charging system warning indicator

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Check charge light come on Chang battery then light is on again

I have a 2011 Ford Edge 3.5 SEL I have been problems with charging system I don’t understand why my battery is not charging I was told my fuel pump my throttlebody my injectors to and clean my fuel Injectors then I just purchased a new alternator had it put on got a new battery connected that steel car will turn on and then shut off I was told that the alternator was not getting enough voltage so I’m going to try that tomorrow and see if there’s voltage coming from the alternator I just don’t understand I got a new ECU but I cannot get it programmed without holding a charge for more than 10 minutes does anybody know what I can do or what they think that this is I’ve only had this car for eight months and I’ve already spent $1700 in two weeks including labor this is crazy I don’t understand today the mechanic came over took the positive off the battery in my car stayed on as soon as he put it back on the positive it turned off so he’s telling me that the alternator is not receiving Enough voltage to charge up the battery I hope he’s right because I’m tired of paying and paying and not having a car if you could please email me back at cynthiaklamert882@gmail.com I don’t know how to get back on this website to receive the answers so please email me if anyone can help me thank you and God bless

I just want to know if anyone has any input could it be my ECU or electrical or the alternator I have spent so much money on nothing on parts that I didn’t even need someone please read this and help me