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I dropped my spare tire and found this today. The wiring comes from the front of the truck, plugs in as shown, then goes back to the front of the truck somewhere. If I unplug it, it will plug into my factory 7 pin plug. I didn't take the time to see where it goes. Anybody know?

 

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NOt sure about the plug under the spare but on my truck attached to the frame rail b/t the cab and bed was a secondary wiring harness for an in-bed camper which in my case now powers my gooseneck trailer. I know there is a thread on here that discusses it. If I find it I will repost it.
 
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