Hello everyone not too long ago I purchased a 2010 Chevy cobalt LT. I noticed the voltage while driving drops to 12.5v. When the car is started it has 14.2 but once it gets above 80* outside temp or when the engine reaches operating temp it rapidly falls to ~12.5. Last month it refused to start and i replaced the battery but the problem remained. I then replaced the Alternator but the problem is still apparent. I have taken it to the Auto parts store and had testing done on both new parts while inside the car but it all checks out good. Any ideas?