SSVC-2 connector installation
a. On the SSVC-2 use a small flathead screwdriver or your
thumbnail to raise the locking tabs, exposing the holes on
the removable connector plug.
b. Insert each wire into the appropriate hole on the removable
connector plug, and snap the locking tab down.
NOTE: To help you avoid improper installation, the
connector plug is keyed.
c. Insert the smooth side of the connector plug into the
smooth side of the socket. Don't force the scalloped side of
the connector plug into the smooth side of the socket. See
Is it possible you have lost the removable connector plug? Sometimes folk get some used and don't reveal they are missing parts that came with the unit.