installed brand new bulbs (2) wont come on. No error message. Marked wires but wondering if i marked them wrong. There is 2 black wires, a brown & blue total of 4. Have no access to a meter either or any schematics. I have the brown going to wht.on bulb for D.S. & Blue going to wht. on bulb for O.S. that is for back bulb. Front I have black to wht. on D.S. & Black to wht. for O.S.