Maybe onto something....
Louis, it seems that the wiring diagrams are very similar for the defrost and compressor control on most of these. Please see this drawing.
It seems the brown wire is supposed to be the Line side of the power cord, only. It needs to go to the power cord but not be tied together with anything else.
The white (ivory) wire was part of the original 3-wire condenser fan circuit which you will not use. Isolate it.
Remove all the connections in the compressor compartment except the single wire to the defrost coil.
Connect the power cord line side to the Brown wire.
From the Orange wire coming out of the cabinet, connect the following things together:
-Orange wire from cabinet
-One of the Supco power input wires.
-One of the fan motor wires.
-Power cord Neutral side.
From the Black wire coming out of the cabinet, connect the following things together:
-Black wire coming out of the cabinet.
-Remaining Supco power input wire.
-Remaining fan motor wire.
-Remaining Defrost coil wire.
