Gotta be a two wire female bullet...trust me. The single leads on a 65/66 for blue/black are the courtesy lights that hang under the dash.
The black wire with the white female bullet is ACC fused power and is sometimes used for the wiper system. Believe it or not, I've never been able to adequately figure out the wiper system in relation to its wiring...probably because the wiring rarely fails. Anyway, I believe this female bullet is left alone in almost all applications.