Hi Spook,

* Besides reporting on what happens when you pull Fuse 19.

You can measure DC volts at the top of ATC Headlight Fuses
Use cigar lighter ground.

with low beams on:
drivers low beam fuse 19
passengers low beam fuse 20

with high beams on:
driver high beam fuse 17
passengers high beam fuse 18

Did you say the lights are all dim on the driver side.
Is that all lights: Hi, Low, Parking, Turn signal?

* Your failed and repaired front driver side ground, 31/2 needs to be tested.

An easy way is to disconnect the negative battery terminal and
measure between pin 4 (ground) of the drivers headlight connector
and the negative battery cable end with your ohm meter.
Use your lowest scale and read close to zero ohms.

Headlight connector Pins 1 and 2 should not show any continuity to
pin 4, and the battery negative cable end using the highest resistance scale.

Report back, Bill