Headlight case has water inside and adjustment screws broken

A dim headlight probably has a poor connection - this is usually the result of corrosion in the headlight connector or the ground terminal. To fix this, remove the connector from the headlight and inspect the terminals on the headlight and inside the connector shell. If they appear dirty or tarnished, polish them (you may need to use Scotch-Brite or a similar light abrasive material). Next, trace the black or green wire to find the other end - generally it is attached with a sheet metal screw to a metal part of the body near the radiator. Remove the screw, polish any rust off of the body panel under the screw head, and polish the ring terminal on the end of the wire. Put it back together and coat the screw and terminal with grease or other protective compound to keep water out of the connection (do not coat the parts before putting it together unless the protective compound is specifically designed for electrical contacts).

Another common cause of dim headlights is deterioration of the plastic housing - there are a number of headlight polishing kits on the market to clear up the problem (pun intended :) ).

If the headlight is at full brightness, it may not be aimed in the correct direction. First, verify that the vehicle suspension is in good order; a sag or tilt will cause the problem. There are two or more spring-loaded screws in the headlight mount. To adjust, park on a level surface with the vehicle facing a wall or garage door. Turn on the lights, then adjust the aiming screws until the headlights are at the correct angle. You will probably have to fine-tune the adjustment after checking it on the road, so take along a screwdriver for the check. If you can get the aiming specifications from a service manual (e. g., Chilton's on Haynes manual; available at many car parts stores), you can adjust the beam spot more precisely.

The Sunfire 03 to 05 has one adjustment screw at the top. The back of the headlight has a tab that has to fit into a hole in the radiator support make sure it is in there or the headlight will be loose. I found after breaking the two adjustment screw plastic brackets. Remove the parking light brace from the radiator support one screw and as you carefully slide the headlamp in while pulling out the parking light. Hook the back of the bracket on the radiator support. If you break the plastic adjustment bracket (it twists in like a headlight bulb, but you can't buy it. Thank you GM) remove the broken piece of plastic and the rubber washer and spread it with plastic epoxy sets in 5 min and full hard in 24 hours, but hard enough in one hour and you can now beat it to death and it won't break why didn't GM make it permanent?

There are screws in plain site to remove the chrome trim

No cables involved ,just headlamp adjustment screws

Are your headlights beams too high? too low? Then bear with me and maybe I can help
Horizontal headlight adjustment is easy. See the screw on the inside top of each light? turn the screw left and your headlight beam goes outward; turn the screw right and the beam goes inward, (toward the center.)
Okay now Vertical adjustment is a little more involved. Start by removing the corner lens; take out the screw on top of the headlight and pull the corner lens forward. This will allow you to access two 10mm bolts holding the headlights in on the sides.
Remove those, along with one 10mm nut on the backside of the headlight assembly (near where your bulbs plug in). Remove your headlight bulbs carefully - I usually put a paper towel around them to protect them from dirt and oil. Now the only thing holding your light housings on are the horizontal adjustment
screws. Just slide the screws out from the lens, and then remove the headlight from the car.
If you look at your headlights now, there is another screw that looks just like the horizontal adjustment screw.
In order to adjust this, you need to remove the 10mm bolt labeled "A".
Now slide the plastic headlight base off of that bolt. The whole plastic base will now be free to swivel on the adjustment screw. What you need to do now is to turn the plastic base around the screw; if you turn it clockwise or right, it will lower your headlight beam when reinstalled. If you turn it left, it will raise the beams.
I ended up only turning each side lower by one revolution. You shouldn't need more than one or two turns. It also becomes hard to slide the housing back over the "A" bolt after two turns. If
in doubt about whether the beams will be raised or lowered, on the final pic you can see the clean area of the bolt on the left side. if you lengthen this side, it causes the beam to go down.
Its really easier to understand as you are doing it, if this does not seem clear. Just use some common sense and you'll see what I mean.
Installation is the reverse of removal.

• 
  
• 1.
  Remove the two upper screws from the headlight housing, using a Phillips screwdriver.
  
• .
  Locate the two lower retaining nuts inside the engine compartment at the bottom of the headlight housing. Remove the nuts using a ratchet, extension and socket.
  
• Separate the turn signal and marker light assembly from the front grill. Rotate the bulb holders counterclockwise and pull them out of the assembly. Set the assembly aside.
  
• Unplug the headlight bulb connector from the bulb. Rotate the retaining ring counterclockwise one-eighth turn and remove it from the housing. Pull the headlight bulb straight back and out of the housing. Do not rotate the bulb during disassembly.
  
• Lift up on the headlight housing retaining clips to unsnap them from the headlight housing vertical adjuster studs.
  
• Locate the horizontal adjuster at the outer bottom corner of the headlight assembly inside the engine compartment. Loosen the horizontal adjuster until it is free of the adjuster nut.
  
• Remove the headlight housing from the vehicle.
  

Installation

• Install the headlight housing in the front grill.
  
• Engage the horizontal adjuster screw with the adjuster nut and screw it partially in.
  
• Snap the headlight housing clips on the vertical headlight adjuster studs.
  
• Insert the headlight bulb into the headlight housing, flat side up. Slightly rotate the headlight bulb to engage the grooves in the light with the alignment tabs in the back of the housing. Install the retaining ring on the bulb. Plug in the headlight bulb connector.
  
• Install the bulb holders in the turn signal and marker light assembly. Install the assembly in the grill. Install the two upper screws, using a Phillips screwdriver. Install the two lower retaining nuts, using a ratchet, extension and socket.
  

Headlight Aiming

• Pull the vehicle to within a few inches of a blank wall, on a flat surface. Apply two strips of tape to the wall vertically to mark the centers of the headlights. Apply a strip of tape to the wall horizontally to mark the center of the headlight height. Back the vehicle up 25 feet in a straight line.
  
• Turn the headlight low beams to the "On" position.
  
• Adjust the vertical headlight adjusters until the high-intensity zone of the light pattern is two inches below the horizontal mark on the wall.
  
• Adjust the horizontal headlight adjusters until the high-intensity zone of the light pattern is two inches to the right of the vertical headlight marks on the wall.
  

HEADLIGHT REMOVAL AND INSTALLATION
SEALED BEAM HEADLIGHTS REMOVAL 1 When replacing the headlight,do not turn the spring-loaded adjusting screws or the headlight aim will be changed 2. Remove the cover over the headlight this vehicle has five screws securing the cover other models may have four or six screws. 3. Remove the four screws which secure the retaining ring around the headlight support the headlight as this is done. 4. Pull the light away, unplug the connector and remove it from the vehicle. INSTALLATION 5. Position the new unit close enough to connect the wires. Make sure the numbers molded into the lens are at the top. 6. Install the retaining ring and mounting screws. 7. Install the plastic cover to the headlights with the screws you took off and check for proper operation. If the adjusting screws (spring - loaded adjusting screws) were not turned, the headlight should not require adjustment.

You really need to clarify what you are trying to do!

The headlight case is secured by two horizontal bolts at the top of the case, visible from outside the car and under the hood when it is slid forward but not raised, and one vertical screw at the outside of the case that connects to the body or side lamp case(?) and is visible from inside the engine bay. There is no adjustment to the fitting of the headlight case to the body.

Aiming the headlights is done with the nylon knobs on the back of the headlight, from inside the engine bay.

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

Headlights, Removing and Installing

Removing

• Remove front bumper.

• Remove both Torx bolts (T30) -1-.
• Remove interior Torx bolt (T30) using 1/4"-Torx-bit insert and extension.

NOTE: If necessary, use magnet to remove bolt.

• Disconnect multi-function harness connectors for headlights.
• Turn headlights -2- toward center of vehicle and remove from chassis toward front.

Installing
Installation is reverse of removal, noting the following:

• Adjust dimension -a- via plastic bolt at new headlight.

NOTE: Determine dimension -a- at plastic bolt of old headlight, when being replaced

• Engage headlight in area of center of vehicle in guide -2- via pin -1-.
• Always align headlight according to contours of chassis (gap dimensions) and secure.
• Adjust headlight after installing.

Tightening torque

Component Nm Headlights to lock carrier 6


Repair Kit For Headlight Housing, Installing

NOTE:

• Headlight mounting tabs that have broken off can be replaced by installing the repair kit. Complete replacement of the headlight is therefore not necessary.
• Different repair sets are available for the left and the right headlight.
• Remove headlight with broken mounting tab.
  • Remove remains of the broken mounting tab -1- at location marked with the arrow.
  • Place mounting tab -2- of repair set onto the edge (arrow) of the headlight housing and secure the tab with two screws -3- from rear.

just changed headlight out in my 86 300zx today. have to have headlights up. there is a casing around the lights (highlight/fog), screw on each side that has to be removed. bottom of casing snaps out... then you have to unscrew the screw that is on top side of lamp and on the inside of the lamp (inside meaning towards middle of car) enough to get headlight out of posiiton, but don't forget you have to unplug the wiring from the back of the headlight from the back of the lamp.. thru under the hood... i know clear as mud right.. :) then change out lamps and put back together... :)