The car is an 89, and Im basically talking about the dash harness. One the 89 the dash harness does not extend all the way to the headlights. Basically its got a bunch of plugs at the A-Pillar in the kick panel, goes over to the A/C box and amplifier,
a few other various boxes under the dash, etc. But when it goes through the firewall, I cant think of too many things the harness actually attaches to. All I can think of off the top of my head is the wiper motor and the brake level switch. Other than that, it has 2 plugs by the booster that interface with the engine harness, and below the ignition coil there are some plugs that connect to other harnesses that go up to the headlights, horn, etc. but the dash harness in the 89 doesnt actually connect to the headlights or fogs, it connects to other harnesses which do that.
Thats why I was hoping that the 4 cyl and GT dash harness would be the same, hoping that for a mid harness that Ford would be able to justify adding the wires to all the harnesses as opposed to having 2 or 3 different part numbers that varied in cost insignificantly.