So bought this GMC and it has a 7 pin plug under rear bumper, previous owner never had a brake controller installed, so have no idea if he ever used it, but also found a wire harness by drivers side between cab and box, I will add pics, but my question is, if I can plug my fifth wheel into it will it power everything, and if I buy a brake controller and harness that is plug and play, will it then have brakes?
And the same with what is on the drivers side, are they wired in so that all power is there and with just the addition of a brake controller will there be power to brakes?
And of course, what controller should I buy?
Any part numbers for it and the harness?
Thanks
Here I hope are the pictures.