Scotty,

 My son inherited my 2003 Monte Carlo. He loves the car and we have been fixing it up from front to back. While he was away in the Air Force I worked on at nonstop though let non stop thought everything was perfect for him , but when he came home a problem started that we just can't fix.

The car's windows would not open the sunroof would not open and the headlights would not work all at the same time.

 After messing with it I noticed that if I shook the block of wires on the fuse Box everything started working again in the end we replaced the entire fuse Box and the call was working great for 2 days with no problems now it is doing the same thing and unfortunately no matter how many times I pull off that connector and clean the wires and contacts nothing is working.

I checked the 3 grounds that I could find I don't know what else to do?

He is extremely disappointed and I feel horrible about it we did so much work to the car together but I am not a great electrical person if you put anything mechanical in front of me I can fix it.

What can you suggest?