Mystery Electric Plug

[JBK]

Didn't know what area of the forum to put this question in! Last November I purchased a 2017 GMC Sierra SLT. In the glove box there was an electrical plug which I have attached pictures of. I have yet to find anyone who knows what the plug is for and where it might plug in. If someone knows could you please post a reply. Thanks in advance!!

[garic3712]

Trailer harness adapter?

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[JBK]

Don't know, the truck came with the built in trailer braking system, hitch, and the 7 way trailer plug plus 4 prong trailer plug already built into the rear bumper. Truck has the tow package.

Thanks!

[davester]

maybe the P.O. was having problems with the plug on the truck and bought that to help test it?

[rah7777777]

Previous owner had a home made “custom” trailer most likely. 

 

Or had an old trailer and just needed a legal way to move it once in a blue moon. 

[TwoBallScrewBall]

Those pins don't align with the 7-pin orientation, if you look at a 7 pin plug, the pins align with the 'edge of the circle'   Those are all in line with each other.  So I can tell you it's not a 7-pin.   Unfortunately, I can't tell you what it is.   It does look like some sort of test rig.     

[TwoBallScrewBall]

although, it might mate up to the plug on the back side of the trailer plug, and they might have had something else that got plugged into those 6 male spade connectors.   Maybe a utility shell or like was said some old or custom trailer.    Although I would question why they wouldn't just use a trailer-side 7-pin with the same pigtails to do the same thing.   Now I'm interested

[NCPGMC]

I was going to say a camper shell or a backup alarm...