I changed the alternator and fuse box, but the alternator is still not charging. At 13.5 volts, it jumps from 12.8 to 13.4. I think it might be a wiring issue.
All the battery cables and engine ground cables need to have a voltage drop test done to determine whether one or more cables are not making a good connection, or the cable has a defective connector crimp. I recommend that you have a mechanic, such as one from YourMechanic, come to you for a proper diagnosis of the issue with your alternator not charging.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing