drivers side headlight dim

i run 80/100w bulbs on stock headlight harnesses.

heres the problem:
in the parking light position both parking lights work fine at normal brightness.
when i turn the headlights on, the passenger side headlight/parking light turn on fine, but both the driver's side headlight/parking light both go very dim, as if there isn't enough power being supplied to the driver's side.
the highbeam works on the right side, the driver's side stay the same (dim).
i think either theres a bad ground or the harness is melted.

any tips?

thanks!

n0v8or said:

I agree with your assessment. A bad ground connection that is common to both the headlight and parking light on one side. Is the directional signal on that side also affected when the headlights are on?

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i THINK it is working on the drivers side even with the headlights on.
the left blinker on the instrument cluster is lit up because of the dim headlight, but when i turn on the left signal the blinker turns on and off normally.

edit: i forgot to add, when i highbeam with just the parking lights on, the driver's side parking light goes normal->dim and the headlight turns on dim also.