If your theory is correct then diodes in the circuit will prevent the back feed I believe. I used them in my Ducati which as with most motorbikes has a single indicator bulb for left and right.

Wow.

Problem solved, and I think I know why - thanks for the comments.

MiniMike - lights are flashing, so the flasher is working correctly.  Would suspect the flasher if things were staying on, or could be a break in the circuit there if they weren't coming on at all.  As it is, flashing is fine, so flasher is likely fine.

Doug - Interestingly, the issue wasn't a problem with the hazard switch - I believe it's working as expected!

Turns out it was trying to have the green light at the top of my speedo indicate both left or right turns - I was reading through the instructions on round how to convert to a center binnacle, to understand what all the lights in the binnacle should be hooked up to:  //www.theminiforum.co.uk/forums/topic/115376-converting-to-a-centre-speedo/

The line "If you want only one single indicator warning light, ie. only one light that flashes when both indicating left and right. Then simply connect the green with red and green with white wires to the same warning light." was what lead me to believe this would work.

BUT - if you look at the wiring diagram circuit, if these two leads are connected to the wire, when the column switch energizes one of the leads to the green dash bulb, the fact that the left and right leads to that light are connected causes power to flow BACK along the non-selected direction wire to the "hazard portion" of the hazard switch, which feeds from there to the front and read turn signal lights!! 

So, in this instance, when all the lights are flashing when the column lever is set to say, left turn (with hazards off)
 - The normal left turn circuit is working as expected, causing front and rear left hand signals to flash, AND
 - Because the left and right turn signal wires are connected at the dash bulb, current runs from the bulb down the right hand wire to the hazard portion of the hazard switch.  Since the hazard switch is in the off position, the current in this case only goes to the right hand lights.

So, I think, when all lights are flashing, one side is flashing as a part of the normal turn signal circuit, and the other is being energized by current going to a part of the hazard portion of the hazard switch.

Woo-woo!  Any comments to collaborate my thinking?

Also, I would still be interested in the green light above the speedo flashing regardless of whether the column lever is set to a left of right turn - anyone have thoughts on how this might be done?

Scott

+1 to Mur's comments.

Backing the calendar up... have the turn signals ever worked correctly for you?  If so, what has been done since they last worked correctly?  (Not what have you checked, what work has been done on the car since they last worked?)

EDIT:  I spent a little time looking at the wiring diagram (both the one you posted and another).  The only way the left and right side indicator wiring can be connected is at the hazard switch.  Therefore, the problem is either in the switch.  Alternatively, if you have been working with the car's wiring, it is possible the wires are not on the correct switch terminals.

I have not encountered this nor has anyone had a similar query on here that I know of.

You would be best served by getting a test lamp and a meter, carefully studying the wiring diagram and sorting this out. 

Obviously, the Left and Right signals circuits are connected when the hazards switch is turned on, so a careful inspection of the Hazards switch would be my starting point.

Inspect the switches, the wiring front and rear and then let us know what you find.

try swapping out the flasher unit.  Usually it's the simple stuff.

Hey all,

Still tracking down one more electrical issue, looking for some help.  My reference is the 1984-on carb with center multi gauge wiring schematic.

Issue:  Putting either the left or right turn signal on causes all lights to flash, as if the hazards were on.  (Hazard switch is off)

Things checked so far
 - When hazard switch is turned on, all lights flash as expected. 
 - When hazard switch is turned off, with the column turn lever in the neutral position, no lights on/flashing
 - Have removed the switch and jumped across the bottom two contacts, same behavior as above, with all lights flashing when column lever is moved to indicate left or right turn.  All off (as expected) when column switch is returned to neutral.
 - Lights are flashing, so expecting the flasher unit is fine (otherwise the lights would be on or off all the time)
 - Have tried two hazard switches, and both behave the same as above (I understand there are two circuits managed by the hazard)
 - Have opened up both hazard switches, and all contacts are clean, the mechanism inside moves freely
 - Confirmed that the wiring harness connector has the expected wires coming into the connector in the expected places, per the wiring diagram.
 - I have both the left and right wires coming into the single green light at the top of the speedo - I thought that might be a problem, but I pulled the bulb out, and still see the same behavior.

From looking at the wiring diagram, i understand that the current comes into the flasher via a dark green wire.  A Light Green/brown wire then takes the current to one of the two isolated pins on the hazard.  With the hazard switch off, the mechanism directs the current out of the hazard switch via another light green/brown wire, which feeds the signal stalk on the column.

Moving the stalk up or down completes the circuit to feed current both to the the proper set of lights (left front/back or right front/back) and the green bulb at the top of the speedo.

So, thoughts on next step?  Seems super odd that they're all flashing, vs. just not coming on at all.

Thanks!
Scott