Adventures in Trailer Wiring

[legion]

I'm trying to do trailer wiring for the Chevy Express 3500 that I bought a few months ago. I came across an unused 12 pin Molex connector mounted just above the rear bumper. I assumed this was for trailer wiring, but I can't find anything that appear to use this connector. Does anyone have any idea what this is for? It has a part number of 33472-1206 printed on it....which turns out to be a specific model of 12 pin Molex connector.

[dad911]

I've been buying harnesses from sites like etrailer.com. Just punch in the year, make, and model.

Not sure of the year, but if this is it, well worth $22 : https://www.etrailer.com/Custom-Fit-Vehicle-Wiring/Chevrolet/Express+Van/2018/118392.html?VehicleID=20181170726


Even if you don't buy from them, they have installation instructions and videos that will point you towards the right wires.

[legion]

That's actually the harness that I have. I just want to know what the heck the molex connector does.

[legion]

Here's some pictures of the connectors with an unknown function:

(Pictures are taken from the ground looking straight up.)

[RANDY P]

I'd suspect some other commercial use- power for lights or noises, ambulance?

Worse comes to worst, roll your own. Install a conventional trailer harness. Easy.

[rockfan4]

General internet consensus is it's for backup sensors.
Connects to this -
https://www.amazon.com/Genuine-GM-22899761-Object-Harness/dp/B00GUBLAIO

[legion]

Thanks! Now I know it has nothing to do with trailer wiring.

[john70t]

The electric brake kits look like they use different type of connectors and thicker wire:
https://www.amazon.com/s/?ie=UTF8&keywords=trailer+electric+brake+kit&tag=mh0b-20&index=aps&hvadid=78408984085009&hvqmt=e&hvbmt=be&hvdev=c&ref=pd_sl_drk50iza9_e

[legion]

Linky no worky.

[john70t]

Now it doesn't work for me either.
Strange.