Probably the easiest way to rig it would be to swap the wires on the back of the fuse holders. Disconnect the battery, remove the screws to hold the fuse rack and lift for access to the backside. The wire color codes TO THE HEADLIGHTS are HI-BEAM.... WHITE RH ..... WHITE/BLK LH and LOW-BEAM.....YELLOW RH.......YELLOW/BLACK LH

The easiest way to swap it temporarily is on the feeder side, coming from the combination switch, which is swapping the WHITE and YELLOW wires.

Trying to swap at connectors involves the high risk of breaking a connector and a host of other problems.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )