I did ask my mechanic because I have no idea what to do with the cables. Once done, I was very happy because it really adds a + in my car, it's nice and we see very well :)
But as the comment Vidal March 15, 2014, these lights are not waterproof and screws rotate endlessly and even for that price, well avoid them.
I had 2 screws not take, I had to stick the plastic glass to fit. After several days of rain and a car cleaning rollers, the lights were dead.