A bulkhead connector system exist on any vehicle for one reason...production line installation. Other than that they are worthless. Why replace a shit-quality part with another used shit-quality part that has the same issues? The only reason that I can think of is...for a complete, correct restoration. Otherwise, get rid of it!
How?
Sparky did his here a few weeks ago while learning how us make wiring repairs and crimps. Simply replace each male and female "bulkhead termination with an appropriate insulated male or female bullet or slide connector. Then seal the hole to prevent engine bay gases from entering the cockpit.
A neater way is to use a barrier strips mounted to the bulkhead with ring terminal connectors. The barrier strip must be of sufficient ampacity for the load, I use 30a strips with a separate connection point for the ammeter feeds (the two 10 gauge wires, one of which uses a fusible link which is the red segment). There is enough slack in the interior harness to pull it through the bulkhead if you remove and oem tiewraps under the dash that secure it.
To remove the bulkhead-mounted portion of the oem connector, cut it away with a razor knife.
I'll have to dig up the correct schematic you are looking for.
This is a pic of sparky's bulkhead connector elimination training project. He ran out of time before he got to eliminating the other connector, but that one is not the problematic one. Now the rig has been sold and someone else will have to finish it! This was a repair so that sparky and mrs. Sparky could eliminate gittin' stranded at wallyworld from their lives, this is not a best practices kinda fix, but a repair that is functionally sound.
