OK so I previously had an electrical problem where my batteries were only charging at 12-13v. long story short I fixed everything by replacing factory grounds, doing big 3, replacing BCM and ignition switch. Now my batteries are in the 14's.
NOW for the real issue. after i did all of that all of my interior lights dim like crazy, never goes above 13.5v and when I use my door locks or power windows it drops all the way down to like 11ish volts. and headlights dim like crazy.
so from what I know about electrical sound like another ground issue, so my question is there like an interior ground or something? How do I fix this