This morning I freed-up the front portion of the the wiring harness, which enabled me to remove the entire headlight and dash wiring harness assemblies.
The harness wraps around engine bay from the driver's side firewall down along the edge of the hood and then around the front of the car. I already disconnected the horns, headlights, and parking lights previously, so the harness was mostly free from the front of the car (with one exception described below).
Moving up the car from the headlight connections, the wiring harness is grounded to the frame with a bolt that also grounds the alternator. Just above this harness ground is a branch of the harness that connects to the alternator. The connections to the alternator are shown below, right.
Further upstream are two clusters of connections to what I assume to be resistors. I labeled and removed these connections, four connections on one unit and three on the other. Then the harness was free up to the firewall with the exception of a yellow wire.
This yellow wire was soldered onto a red wire that connected into a box that interrupted the fuel supply. I assume this is a fuel pressure sender (?). Anyway, I cut this wire with the expectation that I will replace the soldered joint with a connector upon reinstallation.
With that wire cut the harness was free up to the firewall grommets. Inside the car, on the other side of the firewall, the dash harness splits into two branches. Both of those branches penetrate the firewall on the driver's side. The outermost branch is the (right-side below) is the headlight harness; the other branch (left-side below) has three connections to the starter. I labeled and disconnected these and then pulled that branch of the harness through the firewall and into the car.
On the inside of the firewall the headlight harness connected to the dash harness with three connectors. I labeled and disconnected these and then was able to pull that section of the harness through the firewall in the other direction and out into the engine bay. This divided the full harness into two separate sections that could be re-connected together.
The dash harness was still connected to the flasher fuses just inside the firewall. I removed the two bolts that held these cylinders into the body and then labeled and disconnected their electrical connections.
Then I pulled the dash harness through one more hole in a plate that comes down under the dash and it was free.
Here are the two sections of the harness re-connected together. The dash wires are at the right of the picture and the headlight section is on the left.
