Lights flicker 1972 Chevy Truck

[mvpco]

HI List!

I am stumped!
My lights(Headlights, dash etc) flicker when driving or parked. I can move the shifter (350, AUTO on the column) and when I put pressure on the gear shift it stops flickering, I can jiggle the shifter and see the lights flicker.

What I have done,
New Battery (still flickers)
New Alternator(still flickers)
I even disconnected the neutral safety switch and still flickers

also I noticed my dimmer switch does not have high beam, (I ordered one)
I have also ordered a new Headlight switch...

I checked the junction on the passenger side by battery and replaced that wire, (still flickers)


Any ideas?

Jeff Smith
Pensacola, FL
850-475-5030