My headlights when turned on in my Ford Focus C-Max keep moving up and down, If you stand in front of the car and look at the headlight you can see both sides moving up and down what is causing this?

Depending on the model, recent or latest model has built in
adjuster for headlight. Otherwise, if your car don't have, then
you have to open the front hood and locate one or two screw
bolts besides each headlight. If you only see one (1) then
that can adjust up and down only focus. If two (2) screw
bolts, one screw bolt can adjust up and down (vertical) focus
and the other screw bolt can adjust left or right (horizontal)
focus.

Switch will have to be replaced,

All types of car headlight problem troubleshooting.Click the link below :---All headlights not working? http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html
---------This will help.Thanks.

SOUNDS LIKE LOOSE DASH CONECTOR CAUSING POWER LOSS
AND SWEEPING GAGE WHEN POWER RETURNS

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• Ensure that the headlights on your Ford Focus are off by checking you have turned the headlight control all the way to the off position. Make sure your car is off and the keys are out of the ignition, so the daytime lamps are also off.
• Open the hood using the hood release handle located inside the vehicle under the steering wheel on the left side of the instrument panel. Walk around to the front of your Ford Focus and release the auxiliary latch located under the front of the hood. Lift the hood and secure it in place with the yellow end of the hood's strut in the designated holes.
• Locate the bulb cover found just behind the headlight assembly and remove it by turning it counterclockwise. Swivel the wire clip that hold the bulb and connector in place out of the way by turning it to the left.
• Pull out the headlight bulb with its electrical connector straight out from the headlamp assembly.
• Disconnect the bulb from the connector. Later editions of the Ford Focus may have a retaining ring that lies between the bulb and electrical connector. Simply remove this retaining ring by twisting it off with a counterclockwise turn.
• Install the replacement headlight bulb in reverse order of removal. Use a HB2 replacement bulb for models older than 2004 and a HB5 bulb for models produced since 2005. Replace the wire clip and bulb cover, as well.
• Turn on your Ford Focus and check that the headlights are working properly after closing the hood.
  

One is in front of the right front wheel below the headlight and the other is on the passanger side of the condenser next to the headlight

there is one screw on top and one on the side of each light for adjustments

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It sounds like a plug got disconnected during the headlight change.

Check your fuse box. Sounds like it may be a fairly inexpensive fix.

The replacement bulb for the headlight in you Focus is a 9003. There are several variations to this number though. For example GE/Sylvania has a 9003CB--CB standing for "Cool Blue", 9003XV--XV standing for Xtra Vision, etc. Hopefully you plan on replacing both bulbs when you go to do so. You lights will not look like you have one old bulb and one new bulb and you won't have to worry about it going out on you at a bad time and costing you a traffic ticket. Hope this helps and have a great day!