extra blue wire near fuse box

[Jandi]

i have a 2004 Chevy Silverado - 6 cyliner. What do i do with the blue and red wires that are near my fuse box.  i am trying to hook up my electric brakes on my trailer.  the unit installed under my dash will not turn on - i figure it has something to do with the blue and red wires.  my question is how and where do i hook them up??

[citydriver]

It's been awhile, but if I remember correctly the blue and red wires are taped to the trailer wiring harness near the under hood fuse block. The red wire is for the battery +12v terminal on the 7 way trailer connector. the end near the fuse block should be attached to one of the studs on the fuse block and you may need to put a fuse in the block. The decal under the fuse block cover should tell you which slot to use. The blue wire is the electric brake wire that goes to the 7 way trailer connector, this is where your trailer brake controller wire (usually blue) gets connected to. Check this link https://www.etrailer.com/faq-cbc.aspx