where is neutral safety switch

The NSS brown/yellow should not plug into the fire wall it should go to the under hood starter relay. The only wires coming/going through the firewall for the NSS and the starter relay is the yellow wire from the ignition switch cranking position to the relay and the large red battery feed from the relay to the interior.
:worthles:
Not worthless, just struggling to figure out how we can help.
:D