Ignition Circuit Voltage Drop…where to from here?

Ah yes, I know of this white connector you speak of. Wanna know how? LOL. When my alternator shorted out (you might remember that fiasco), it fried the ignition wire and that white connector. I had no choice but to drill out and bypass that connector when I rewired.

Yes, when I bypassed the bulkhead I bypassed the alternator wire as well as the ignition wire. I just checked and The only wires left on that connector are the starter relay and temp sending wire.

So it sounds like I now need to move inside the car, under the column and check the wires/connectors there?