I used one of these on my 7A. I ran a ground wire from every electrical point of use back to this type of grounding block. I did not trust that the airframe was the ground. It worked fine for me. Yes I used more wire than necessary, but I had no radio interferences, or unstable light connections.
I have a suggestion: Label all the ground wires that you attach to that gizmo. You can thank me later
I have a suggestion: Label all the ground wires that you attach to that gizmo. You can thank me later
I'm thinking of running another wire from the firewall battery ground to the subpanel and mounting the grounding block on the subpanel where it should be easier to get to. Any reason not to do this?
This is what it looks like in my installation.