turn signals-help!

[FMags2@domain.elided]

I am still stumped with the front turn signals, parking, marker lamps on my 
U.S. spec '72 Stag and wonder if anyone can shed some light on this one 
(pardon the pun).  The L/R front parking lamps work fine.  The L turn signal 
works, but the R does not; comes on steady but does not flash.  All of the 
bulbs are good, I believe.  Could the flasher unit be bad?  I would think if 
it flashes for one direction then the flasher unti would be O.K.  

My real problem is the front side marker lamps.  The L flashes with the L 
turn signal and does not come on with the parking lamps.  The R marker lamp 
is just dead.  The wiring diagram calls out RO for both marker lamp + wires,  
but my wiring harness has GR for the L and GW for the R.  These are the same 
as the turn signal wires.  There are 4 separate wire bundles coming out of 
the main harness up front.  a 3 wire bundle for the L turn signal (GR, BR, 
B), a 2 wire bundle for the L marker light (GR, B), a 2 wire bundle for the R 
marker (GW, B), and a 3 wire bundle for the R turn signal (GW, RO, B).  There 
are not any extra RO wires to be found.  The GW and GR wires on the side 
markers do not match the wiring diagram, but it appears to be a factory 
harness that hasn't been altered.  It sure looks like the marker lights are 
supposed to flash with the turn signals and not illuminate with the parking 
lamps.  BTW, the rear side markers do illuminate with the parking lamps and 
do not flash with the turn signals.  Any suggestions?

Thanks,
Frank Magnusson
Wichita, KS.