Unterminated headlight connector for use on any H4 or 9003 system where an extra connector is needed for an adapter harness for RetroBright headlights. The tab shown in the 3rd photo needs to face inwards as indicated by the red circle and corresponding red arrows in the 2nd photo.
Using pictures 2 and 3 above, be sure to insert wires with the tab on the pins facing inwards as indicated by the red arrows. Always pull back to see if the pin has been seated fully before completing installation. The circled pin may need to be pushed out slightly before it will seat properly.