Christmas Dash Lights, but no Electrical Problem

[Lockleaf]

My dash lights are all coming on at once, sometimes staying on and other times only flickering. I have checked my alternator and my battery 3 different times just to be sure. Everything there checks out fine. I am thinking the problem is in the wire that sends the signal to the dash.

Anybody able to tell me if that makes sense to them?

And which wire it is?

I wonder if I might need to replace the pigtail on my voltage regulator. One of the two wires has a number of broken strands.

Could this cause my problem? Any thoughts or advice would help. Thanks