hi guys, i have a 96' 2500 and i'm schedulled to pick up a trailer that weighs about 4k tomorrow and i concernded about the electric brakes. does my truck have some type of electic brake controller from stock? i see that the blue wire coming out of the harness runs along the frame rail. i have a brand new TAP impulse digital controller but i'm pressed for time and i lost the wiring directions. there's a heavy white, black and blue wire with a lighter gauge red wire. i believe they're w=battery, bk=ground, blue= brake and r=accessories/ignition? at this point i'd like to know if my truck comes with some type of controller that will work already from stock?