Quite a mess you have there. Connect those 2 black wires with the green bands to the green wire in the harness, connect the black wire from the left to the orange wire, connect the black wire from the right to the light blue wire.
Thank you Dave. I connected the wires as you said and all of the colours were as you said they would be.
Only problem is it still isn't working. The front and rear right turn signals stay on solid without flashing - can hear the click once. On the left the from turn signal is solid but nothing from the rear. I checked the globe and it is fine.
It had a tow kit which I presume explains the left over wires.
That sounds like a bad ground. Any time I mess with my tail light wiring harness, I have to re-seat the grounds to get the turn signals to work properly and they do the same thing you are describing. It might be at the connection under the seat or in the tail light.