Sr20probs

Hey guys I know google is still around but my problem is kinda weird I guess or I’m just not the brightest. Anyways, when I turn the key it clicks once but doesn’t even try to engage or turn the starter. I swapped my old engine harness over and kept the interior harness from the column to the fuse box. The other part of the harness was swapped over. Any ideas why it’s doing this? Would a entirely new engine harness from wiring specialties fix this issue? I just want to drive it. Thanks I’m prepared for some “your a dumbass” comments but it’s okay I probably deserve it lol. Thanks in advance