Crappy parts store voltage regulators
Close to the same thing on mine. And this was one that years ago the same thing where I had to get a second one and pay the extra money and Wallah it worked. No years later not so much! I had what I called a meltdown. it didn't get to the point to where it melt it out of its case but when I discovered the problem had gotten from worst to way too bad I went and bought another one trying to pay the extra of course to get more quality and when I took the old one out an hour and a half after I driven the car it was still almost too hot to touch and the back of it felt like it was about to melt out and I could see a big spot that was melting down.