my car has been shutting off and loosing power all together so i assumed it was the alternator, so i just replaced that with a brand new one and bought a new battery as well and the alternator is not charging the battery. ive been researching everywhere i can too figure it out and i just cant. ive checked all fuses, and now trying to check all wiring ect. my cousin is a mechanic with access to all wiring diagrams and still cant figure it out. have to codes as well popping up a code p0420 and a p0730 any help would be greatly appreciated. its a 1.7l