What are these Connectors called??

Mattax said

I'll take back that red X if you delete the black should always be ground.
While most ground wires in the car are black, the most important feed wires in the harness are also Black.
To remember this, think of it like house wiring. Black is a hot.

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You are mixing two different wiring standards.

For DC circuits (used in automotive apps) the standard is RED is positive (hot). Black is negative (ground).

For AC circuits (used in residential wiring) the standard is BLACK is positive (hot), WHITE is neutral (should be same as ground), and GREEN is true ground.

AC and DC electricity is NOT the same.