Electrical Problem on 68' Westy

Ok, let me try to explain this.
With the headlights off, the left turn signal works fine both front and
back. The flasher sounds normal and the signal indicator on the dash
works fine. The right turn signal works front and back for one flash
and than the front signal light gets weaker but continues to flash. The
flasher sounds normal for one flash and than weakens. The signal
indicator on the dash flashes once and goes out in time with the
reduced flasher sound. Now turn on the headlights - There is a front
passenger parking light (seems to bright), no passenger rear parking
light. No drivers front parking light, but the drivers rear parking
light works. The left turn signal works both front and back, the
flasher sounds normal and the dash indicator works about every other
flash. The right front turn signal does not work, but the parking light
remains on. The right rear turn signal works, but the parking light
does not come on.

Other items to note: The emergency flashers work. The license plate
light does not come on and the reverse lights do not work. All fuses
are good. The right front passengers signal light is caroded but
appears to be functional. The lights are stuck on btight, but I think
that is a signal switch problem.

Any ideas what to check??
The front signal lights have a tab on the back of the socket. Should
that be connected to anything?