Good evening g community, I’d love some feedback. My2005 g35 coupe died on me recently and I jumped it and it worked, however when I turned it off it died again. I suspect it could be alternator or circuit relay cuz I changed the battery a couple months ago and put new spark plugs in like 2-3 weeks ago and installed a a new fuel pump little after spark plugs. It’ll jump but not hold a charge it seems.


Battery isn’t completely dead I can still turn on lights

 

How many volts is it generating while the engine is running? Should be around 14.5vdc or so.

What's more likely is you have some kind of parasitic drain on the system when the car isn't running. The factory CD player is usually the culprit.