Dave, I looked at my '68 wiring diagram (so I don't know if the '69s routing is the same). The grey wire runs from the fuse box to the dash PC board, heater lamp and steering column. A short fuse in the box protects all reostat controlled circuits (the dash lights). I have to ask - you did check the fuse? Also take a meter and see that you have voltage at the fuse. Turn the light switch full clockwise and it should be 12v full counter clockwise should be 0 volts. You did turn on the lights and turn the light switch clockwise? If not the lights might just be in their full dim position. The other side of the fuse runs to the rheostat terminal of the dash light switch.
