I just had some speakers and amp hooked up in my truck. Everything was working fine except i noticed that the back up camera wasn't working anymore when I put it in reverse. So i got my bf, which is a mechanic to fix it. He also had to replace the ground battery terminal and after he did that my onstar/phone/seatbelt light wasnt working. Also my stereo now wasn't turning on when I started my truck like it always did, I have to manually turn it on and off now. Any suggestions on what could be the problem? Hopefully I explained it well enough

 

anyone who did the work needs to backtrack and recheck everything in the area they worked.

these are complex machines when it comes to wiring. could be a connector loose, could be a fuse, could be miswiring.

only the people who did it,,,or a real pro, can fix it.