Hello please help me try to make sense of what the last owner was doing when putting together this stereo system. Believe it or not it was working before I tried to upgrade it but only the front left dash speaker and right front tweeter were working. I have tested all the connections to from the stock connectors to the speaker connectors on the factory wires and they all should be connected, but I put new speakers in the sound bar and they did not work. So I looked at the back of the radio and tried to figure out the issue and decided I should just get a new radio and wiring harness but when I plugged that in it didn’t even turn on, now when I plug in the old radio it doesn’t turn on either, I tried tracing some wires to see where it might be messed up but I can’t make sense of them because some of them are cut off and others go into big cables and there are randomly exposed wires all over the place, then I also discovered a second wiring harness that wasn’t even connected to the first radio in the back and it looked like a mess as well. PLEASE help, I have no clue what is happening here, no videos show what stock is supposed to look like