On my 2007 h3 all the lights was working till I put an adapter on to pull a trailer. Now that I have taken the adapter off my driver's side turn signal and brake light does not work and the bulb is not blown... PLEASE CAN ANYONE HELP ME?

 

Re-trace your steps on whatever you did when adding/removing the trailer trailer adapter, something likely not connected properly.

 

Did you use one of those terrible scotch lock connectors that slices the original wire?
If you did start with all of those wires first. Notorious for slicing the wire all the way through upon removal.