If so, then those are the ones for the backup circuit and the switch is working properly. When you shift to reverse you should have continuity. Use your continuity tester and hook one lead to each of the unused plugs on the neutral safety switch. If you have never had back-up lights then start here. Definitely worth the price if your working on your TBird. The rest of the standard shift harness is run like the auto version per the wiring diagram.įor a more detailed schematic, get the 1956 Thunderbird Electrical Assembly Manual which shows the routing, wire color and diagrams. Again, the wiring diagram shows all wires are black with a red tracer.

I am unfamiliar with the standard shift version, but I believe that the switch is on the shifter underneath the floorboard, comes up through a hole and then to the rear. If you have no wires there now, just run a separate wire right to the accessory terminal of the ignition switch for power. The wire going to the front is connected to a different section of the harness. The electrical diagram shows a black wire with a red tracer for the whole system. It's been awhile since I did my 56, but if I remember correctly there is one wire that goes to the neutral safety switch (automatic) from the light switch and one wire out to the backup lights with a connector at the rear to go to both lights.

Tbird 1956