Ok hello Every one I need some serious help,My 2010 g37x 52000 miles is having starting issues,It first stared struggling to start so I replaced the battery.now 1 week later today I was starting it and it struggled and didn't start I kept trying and eventually it just completely died.i got a jump start and it worked.i took it to a shop and had the battery tested which determined the battery was good.So I figured it might be my alternator so I jumped it and took off the red positive side and the car didn't shut off?????? WHAT COULD IT BE GUYS..

 

Did you measure the voltage across the battery with the engine running?
If the alternator is functioning you should read 14.4 volts

Get yourself a multimeter before doing anything else

Telcoman

 

I'm not sure if my issue was the same as yours but mine struggled to start once before. I did some research online and one of the people suggested pressing down on the gas pedal while starting the car. I tried it and it worked. I believe I either flooded my engine or it was due to just cheap gas. Been using 93 octane since and haven't run into the issue again.