Voltage problems, cutting out when hot

These extra instructions are not Applicable in my opinion…
CE5A7055-3621-42E8-B72B-A63104180AB8.jpeg
Also where it says C note that’s the black wire where the lighting wires in orange come into the other harness plug.
That’s a loan wire coming from the light bulb in the column shift selector, am I able to just splice it into the existing black wire on the new plug?