I have put custome 2 wire, dual filament lights on my old Handa. Rear lights don't work. What is the fix?

Answer 1

Do you mean rear turn signals?
Right signal = blue
Left signal = orange
Ground = green
Running light - connect to brown (tail light). Then that bulb will use the tail light fuse.

Answer 2

Rear lights are turn signal only. You can splice into the running lights for the front and run wire to the rear. Better yet would be to find an aux. wire you could just plug into and run wire to the rear.

If you want to spend the bucks, go to J&P Cylcle and check out Badlands products.
Good luck with your project.