problem with head lights

hi,
i have a problem with my Nissan sentra with my left head light, the right beam working fine on low and high beam, but the left beam doesn't work at all on low beam, and work fine on hight beam.
the bulb is fine ( i tried to change it).

so what could be the problem, anybody know ?!

helppppppppppp

IF the bulb is good, then it has to be wiring. use a multemeter and check for voltage at the plug that goes to the light. you should have voltage when the high beam switch is activated. if not, check for breaks. it may be a poor connection going into the plug.

thanks, you right it's the contact !