7 pin wire harness

[houndog3]

2005 2500hd i have the rpo code uy2.So im wiring a 7 pin plug in my box but I got 8 wires!! 1 extra, I Have 2 blue wires im not sure about,a lt blue and a drk blu I saved the tag that was at the end of the bundle but its in rough shape I think it says dark blue=AUX and lt blue=chmlel(I think) I do know 1 is my Electric brake,Do I tie the Aux wire with my red wire(12volt) on pin #4 will i have the red wire and 1 of the blue wires on pin 4 togeather..thx for any help

[houndog3]

thx to me I got lucky and found it..thx for all the help