Trailer wiring help

[Bernoff]

Hey guys need some probably simple help. Two wires coming from truck and two wires at brakes. Broken wires have lost the color coding on them. Is it going to work if on one set of brakes the wires are hooked up in reverse. Is there a certain wire that is positive to all four brakes? Thanks

 

[papajake]

White wire is always the ground it is usually grounded to the frame it is best to ground each backer plate or brake to the frame your blue wire will be the power from the trucks plug and your brake away just trace it back from the chassis on the trailer hope that helps