Dim Headlights

Did a adjustment today on the headlights because the pattern was off and had trouble seeing at night the driver,s side was low & passenger was good. My neighbor said they still look dim though. I checked the after market gauge panel & when lights where turned on it dropped from 14 volts to 12 volts the battery checked out as good when a load test was done.Could it be the headlight switch or the dimmer switch or both.Any suggestions