Voltage Regulator problem

Someone may have eliminated the CE37 connector. and with it the VR plug.
upload_2021-7-20_22-22-16.png

That's OK.
Get a pigtail for the regulator and wire it in.

If you want to test the connections are correct, disconnect the battery and check for continuity in the wires.
It wont show the quality of the connections, but it will show if things are connected correctly.