Headlight low beam short

i own a 2008 Toyota Tundra. I have a problem where there is a short from the passenger headlight, after market headlights by the way. I believe that the headlights Aare spyder Brand. I have tried re-wiring the lights where the wiring connects to the piece that holds the buld and that seemed to work for a little bit but there is evidence of melting wires or charing on the wires where hey go into the piece that the bulb plugs into. Does anyone know if replacing the wiring that gores into the headlight back to the factory harness will work? Also where can I find a harness?a link would help a lot.