I have voltage loss, it occurs at the column ignition starter switch. I remove switch and bench test and it is correctly connecting the path to the hot side of the engine fuse box. But on car it is not.
I can also engage starter, and have great spark. Engine tries to run, but we don't get power to 3 critical run fuses: IGN E, ECM 1, ENG 1.

Watching the key cylinder turn, and the ignition starter switch is removed, I see the internal gearing moving the arm that activates the ignition starter switch.

Some prior history. Car stopped starting and changed out the ignition starter switch 8 / 2022. Afterward, I had to fully turn the ignition switch to engage starter, but it worked. It was notably different than the factory switch I had just removed. This makes me think my underlying problem was probably there already. Car has miles, around 215K.

I see there is a cable that returns to a preset spot that can affect removing a key. And there is the entire casting (named what?) that the key cylinder and the ignition starter switch go into, which is another wear out part. I have no problems with key removal, returning, or operation.

Anyone been here, save me some diagnostic steps?

 

I'll bump this to get it some attention. It sounds like you could benefit from having a wiring diagram to help you diagnose what is going on. Unfortunately I only have my 99 Service Manual. Perhaps someone else has one for the 96?