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I had the same problem with my 2004 ram, passenger side low-beam wouldn't work after replacement. Online I saw many things from socket replacement to Fcm replacement. What worked was to remove fcm (front control module) and clean appropriate contacts with small nail file . Repair took less than 1 hour and cost 0$, wish I could give credit where I found info.
Power for the headlights on the Left side (High and low beam.) comes from the same fuse... The ORANGE wire and the ORANGE/BLACK are the same, they connect in the harness. If you only lack the 12v to make the light work connect them at the headlight assembly.
If your low beam also lacks ground the Left low beam ground is shared with the right low beam ground... Run a wire from left low beam DARK BLUE to right low beam DARK BLUE/WHITE.
If its not working now then your cursed, seek a witch doctor.
Check the fuse. There are seperate fuses for right and left. You dont mention if the high beam works for that side? If it does, the fuse is good. The GREEN wire at the bulb is the ground for the low beam. If that wire has power, then the ground is bad. If the high beam works, the hi'lo beam switch is good, and there is a problem between that headlight and the Engine Compartment Junction Block
There are two adjustment points (screws). For example left headlight: you will see one point near the end of left wing, at bottom side through a wing hole. This is for vertical plane headlight beam adjustment (up-down). Another one point is against water radiator side. This is for horizontal plane headlight beam adjustment (left-right).
First face the vehicle so the battery in on the right. Second open hood. Third Remove the Grill by pushing firmly on two retainer clips that are on the top, use the wide slot screwdriver to get the rest of the clips off. Pull up gently on the grill it should then pop out. The grill extends under each headlight assembly any other retainer clips should release when the grill in popped out.
Fourth on top of the headlight assembly you will see one 1" tab on the right and left side, pull the tabs upward about two inches and this should release the headlight assembly. You then should be able to pull the headlight assembly out toward you.
Finally at the back of the headlight assembly you will see two rubber caps one for low beam and one for high beam, the white base is for the low beam and the black base is for the high beam. Unsnap the wire harness from the bulb base, turn the bulb clockwise.
Replace the bulbs high beam on the outside and low beam on the inside.