[Tifosi]

Green wire:

I'm betting that you got the wrong replacement switch. There is a difference between pre-86 ignition switches and post-86 ignition switches, both in wiring harness and physical length. (the above diagram is for a post-86 switch IIRC, or at least it comes out of the book covering monopod cars, which is from 86~94)

An 86+ can be made to work on an 85- and vice versa, but there's some cobbling involved to accomplish it and the switch housing will be either too short (85 in an 86) or too long (86 in an 85) for the column clamshell cover.

Papajam is aware of what tweaks need to occur and should be able to assist in that department, though simply having the correct replacement ignition switch to begin with would have simplified things. (unless of course the wiring issue is a result of DPO rather than the wrong replacement part)