Voltage regulator location 1966 dart

Did this just start happening, or are you trying to get a new acquisition running?
Now, don't take this the wrong way, but-
In the area where the regulator is supposed to be, are there bundles of wires hanging loose and not connected to anything? Or some obvious non- original splice work on the harness nearby that may indicate that the regulator has been removed?
I've seen stranger things.