Hi, i have a civic 2.2 cdti 2008 that most of the time won’t charge, the voltage is often under 12v and eventually it runs out of battery and dies. The alternator have been changed and it started charging a little bit then ran out of battery after a few days and after that the battery was replaced and same thing lasted a few days and the ran out again. Have replaced the eld sensor inside the fuse holder but didn’t help either. The alternator was a used one but don’t think both could be defect. Before the alternator was changed the battery warning message appeared but that went out after the alternator was replaced. Does anyone have any tips for troubleshooting?