back up lights

I have a 67 dart with a 4 speed and the back up lights don't work.I put a new switch in at the tranny and a new harness from the wiper bulkhead connector to the trans I have power at the wiper bulkhead, but at the connection at the drivers door were it comes in from up top to were it meets from the back I have no power so I traced the violet color wire to the main bulkhead and no power,any suggestions?
Thanks Mike