Drivers Side Head light will come up, but not go down

[vex]

Read above. If the connectors that come from the switch to the relay are not behaving identically and one of the headlights is not behaving correctly but still functions (IE it will come up and move) the issue must be someplace before the relay. The motor itself is operable and has no damage to it, which means that there is nothing blocking the physical movement of the motor. Since the motor comes up under electrical power the brushes and electrical connections are intact. This leaves the issue prior to the relay.