I would go through and triple check all your connections. The common denominator to me is something is not plugged in or is loose after you swapped wiring harness. My FSM for a 94 recommends checking the starter first followed by the NSS. Here is a screenshot of the FSM on the operation.
Can’t believe this still has not been fixed. Reading back through looks like one those solutions would work. Nice to see all the people chiming in, I make a post about an issue and I am lucky to even get a reply.