69 barracuda convertible has no dash lights or inside lights when you open the door

I can reach underneath the dash and grab the wire harness and pull on it then they will light but as soon as I let go it goes out again. I have no parking lights either. All fuses show good. Should I do the dashboard boggie and see if I can find a loose wire? Where would be the first place to look?Any help would be deeply appreciated
Pat Faley
69 vert
67 notch