Lost the lighting on my dash

That is very strange. When you put the meter on the brown and yellow
trace wire there was no power. The wire is the one that supplys power to
the right side lights(2 of them) Then there is power to the left side(2 of them)
but power there.
If it is working good now just leave it.
Yes a good ground is a good thing, I will do that myself.
Darryl