1984 GMC Sierra hei distrbutor wiring

Hello, the bat terminal is ignition feed, the wire goes hot when you turn on the key. I thought it was a pink wire?

On the hei distributors I've looked at, the single terminals are labeled, bat and tach. The bat terminal is ignition feed, goes hot when you turn on the key, primary voltage to the coil, without that, no spark at the plugs. The tach terminal is signal, you can hook a testlite to it, to check for pulse with engine cranking.