Ignition Coil Wiring

[Spikehaus]

Does anyone know the correct wiring arrangement for the ignition coil?

I am having difficulty find the correct wiring diagrams for 1986 sierra, this was the year when every was switched over so the diagrams change!

Anyway as far as I can tell, the ignition coil centre terminal is connected to the distributor cap

I am then left with the black push on terminal (with an additional plug in component that is connected to the mounting bracket screw) and 2 Nr green wires.

Logic says that the black is the negative (-), but Dogwoods diagram contradicts this!

Can anyone help or have photos ???