OEM factory trailer harness

I picked up an OEM trailer hitch from a local pull a parts, and managed to snag the controller as well (bunch of relays and such behind drivers cargo panel) I have not opened up my back cargo panel yet so I don't know if there is a partial wirring run on vehicles that did not come with this option or if I am going to have to splice it in. Does anyone know where I can find a pin out to splice it in and where would be the best spot? Thanks.

You'll find that the connections are already there and you just need to plug it in. At least that's how it was on my '87 and '89.

Cool, thanks. I will pull the panel tomorrow and see whats there.