I am trying to install this on my 65 ford truck but I dont know which post is what. Can someone please let me know which(BAT, IGN, S, ACC) is what so I can correctly install it on my truck.

 

Can't you just check the closed circuits with a test light and battery? Turn the key on acc-check circuits, on run-check circuits, have friend or tape hold start-check circuits? Think or write it down if needed. One being separated from the others and the sweep of the key might offer clues too. Good luck, I am sure you can figure it out.

 

The problem (and has been for decades) is...that C7UZ11572A (Motorcraft SW583) is not the original ignition switch for a 1961/66.

It's the FoMoCo Service Part Replacement for the original 1961/66 switch: C3AZ11572A (Motorcraft SW353).

SW583 has an extra wire terminal on it.

The original applications for SW583 were 1967 Econolines & 1967/77 Bronco's.

 

SW353 available here Ignition Switch - Auto Parts Warehouse

 

The post is for accessories. It is hot in "Accessory" key position and is hot in "Run" position.
B is power in, hooked to battery side of starter relay.
D is Run, hot in "Crank" and "Run" positions
C is crank/start so it is hot only when switch is in "Crank" position
A is not used?