1994 E320 harness replaced but still issues

[mmullins]

Hi everyone! I have been browsing for a while (since I got my car). I bought it knowing the CEL was on and it had a couple more issues. My main concern at the time was that the car was getting hot. I took it to a shop and they replaced the harness, that problem was soleved, and even the CEL was solved, until about a week later. The check engine light came on again and the radio stopped working, I can hear the static noise throught the speakers, but nothing else. The antena goes crazy sometimes when I try to turn the radio on, it goes up an down, but no music.
Has anyone have a clue as to what could be causing this?

Thanks,
mmullins