Had headlights, then high beam only, now nothing

I have decided to eliminate some of the possible causes of electrical problems in the Swinger. Somewhere, along the way, someone installed a fancy Pioneer stereo accent lighting changes colors ever so often & the wiring connections weren't that good. They also wired the power, in by disconnecting the hot wire, to the brake light switch and there are all kinds of extra wires, running everywhere. And the wires are tiny. So, I figured that, especially since I was going to replace that radio anyway, Now would be a good time, to get it all out of the way & give me more access, under the dash anyway. So, that is where I am at now. Kind of difficult though, for an older guy, like myself, to get down under this dash (especially when you are used to dealing with "B" Bodies. But, I am still working, to get there, with this one.