Brake lites

I did a search, and have the schematics. The motor and trans are still out of my 71 duster. there are a lot of unhooked wires under the hood. I do have a good chassis ground and decided to hook up battery to locate dash lites to connect gauges, and looking for ign on power for tach and fuel pump relay. I noticed i only have the drivers side brake lite working. Also the tail lite on the pass side comes on with the bulb out of the socket? Its the brown wire, i traced it so far to the plug behind the drivers front kick panel, the green has power which is the driver brake lite. but no power on the brown.

Unless i got crossed some place on the diagrams this brown wire looks like it makes its way to the Pos side of the coil? is this right. do i need to have all the engine compartment wires connected to get this sorted out?