Re: lighted door sills
Yes the set should of came with a harness that is long enough to go from passenger side to the drivers side for the dr. sill plate and then there is a relay of some sort? I think it changes 12v to a lower voltage for the lights, I'm not sure about trying to make your own for the reason of the relay and relay connector, the wires no problem. But if I were you I would send them back as incomplete/missing parts. If you got a new set you should of got a new harness as well.