well...it might be that your harnesses have a problem...I think you should take out the bulbs from the housing and THEN turn em on...see if one is still dimmer/brighter than the other...and then swap bulbs...see if that changes anything. (dont buy new ones just move one bulb to the other side and vise versa)
If theyre the same bightness (out of the housings and after swapping bulbs) then maybe clean the current housings...they might just be filthy...
after all that is done...try getting new housings
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