I noticed one of my surge protectors didn't have the ground indicator light on. I tested each receptacle with a tester and every single one in the house said "bad ground". I confirmed the tester worked fine by testing at another location. I visually inspected each ground screw and wire nut connection on the receptacles and switches. Nothing was visibly wrong. The utility company said everything was fine on their end.
Here's a photo of the main box heading into the house. Note the 2nd from the top bare copper wire connects to the rod in the ground. The ground rod does seem a little loose though. Could that cause this issue though?
I have not done any work inside the panels & the home is a manufactured home built in 1996.
Google drive for higher quality images. https://drive.google.com/folderview?id=1dxc5dioE0HfCzEHA32i5dFQ-wqAYTe2i