Well, testing out the electrical system in my orange car after I rebuilt ALL the harnesses. My brake lights were acting wierd, the pass side would only light dimly (drv was good!) and the dash lights came on weakly too. After swapping out the light switch, turn signal harness (just restored the column and turn signal mech, so I thought that might be the problem), no change.
Parking lights in the rear would also not come on at all.
Started on check 12V to and through the harnesses and to the light sockets, that was good.
Did an ohm check, and everything checked out, but still no workee.
Then I started checking the ohms with the 12V on, hit the pass inboard light socket to the ground screw and wala!, Lights!!
did some more digging and ran a jumper between the wire terminal (not the screw!) and the ground terminal on the pass inboard socket and lights again!
So even though the ohm meter said I had a ground to the socket, it was in-fact too weak to take the load. I have to take the harness apart and see what is happening.