Newbie Newlywed Questions on a Chevy Express AWD

[fire_strom]

I have a couple questions about my newly acquired 2013 Chevy Express AWD.

There is a wire connector block that I am hoping is ready for a trailer. But I can't find a connection that looks like it would fit from places like the etrailer.com or Amazon, or Chevy parts online houses.
Here are pictures.

Is that the trailer wiring connection?
Here is my build sticker. I tried to correlate one of the codes to a tow package but didn't succeed.

Thanks for looking.
Another question is regarding the torsion keys. I was looking for a paint mark to see which I had as I intend to give this a couple inch lift.
Well, there is no paint left so I can't tell but I noticed the screws on the key seem to be screwed in very different amounts. That seems odd to me. Any input? I am a total neophyte on this suspension type.

That's the driver side.

That's passenger side.
Normal?

Also rust, it is only a few winters old but as best as I can tell they were in and around Flint, MI. It appears that whatever Chevy sprayed on the frame was a rust enhancer. I saw it when I bought the van but it seems worse the more I crawl around under it. The body under there is totally clean and clear. It is just the frame rails that have a discouraging amount.
Here's the frame sticker.


Thanks again for looking, please throw out any feedback you have.
-G

 

[fire_strom]

Sorry about the build sticker up side down. I'll try to fix that when I get to a computer.
Here is one more picture of the wire connecter to give a better perspective of the location.

Thank again!
-G

 

[TeleSteve]

You can find all the wiring diagrams here
https://www.gmupfitter.com/files/media/photo/486/2013_LD_ElectricalFullSizeVans_100713.pdf

 

[fire_strom]

Thanks for the link. There is a ton of great stuff in there. I guess I am still confused though. Are those the trailer wiring provisions mentioned in the guide? If so is there a GM part that plugs into that and adapts to a round trailer plug?
-G

 

[TeleSteve]

Not sure what that connection is for, but it doesn't appear to be for trailer wiring. I believe the RPO code for the trailer wiring is UY7, which I don't see on your list.
If you don't have the factory wiring there several aftermarket solutions. Take a look at etrailer.com they have tons of vehicle specific information, including install videos for most of the products they sell.

 

[45Kevin]

I have the UY7 code on my van, and the 7-pin trailer plug has a wire bundle going from the plug along the outside of the DS frame rail up into van somewhere under the drivers seat.
I'm not sure if it goes into the fuse box (under the seat) or further on up under the dash.
It is not working properly right now, so I will have to eventually track it down, but under the dash is a rats nest of wire from the PO installed alarm and remote starter.
I didn't see any wire plug like you have. It looks stock though. And yours is 6 years newer than mine.

 

[fire_strom]

Hi all,
Thanks for the responses. I went to the dealer and they initially were stumped. Both the parts guys and the service tried looking into it. Gave it a great effort with their resources but in the end just didn't know. The service manager told me he would keep looking under other vans and trying to figure it out. Then I was driving by and there was a brand new fresh van with a factory receiver. I peeked under it and the SM and his shop foreman came out and crawled under too. There was the plug but on this harness it was sticking out of a thicker bit of harness that was for sure the factory trailer wires. The foreman pulled a cap off of the connector that I have and it turns out is is a shunt. He believed it was a bunch of ground wires connected together. I don't know if that is correct but that's what he though. The various colors make wonder but for now I will just wire in with something from eTrailer or the like.
-G

 

[villageidiot327]

you could always get down there with a test light and probe the wires, see if one comes on as brake lights, one for each turn signal etc.

 

[fire_strom]

Yah, true. That was the plan. I went ahead and picked up a t-connector loom to use instead. If I get to testing it I'll post up here for sure.
-G