Electrical Help Needed

I was recently vacuuming my 2017, including pulling out the plastic door sill panels. On the driver side, rear door sill, there is a wiring harness that, for some reason, has wires pulled out in one section and a butt connector on the purple wire. I accidentally pulled the wire out of the connector, so I’ll have to fix that. But can anyone think of a reason why these wires would be out like this? My truck is all stock. No electrical mods. Appreciate any thoughts here!

 

Looks like a T-tap and quick disconnect. Did you buy it new?

 

Nope, used.

 

That's the favorite spot for dealerships to hack up your wiring and install a $5 brake flashing module from ebay and charge the buyer $300 for a nice profit. I'd bet a beer that the wiring they tapped into will affect the tail lights or most likely the 3rd brake light on the cabin. @caribe makaira

 

did some digging and yeup that's what this is. Dealerships will splice those wires and try and charge people $200-300 for a 3rd brake light flasher module that costs a grand total of like $5. If they can't pressure the buyer to cough up the dough, then they just rip it out in 1 minute. Here are two photos, one showing what the module looks like attached. Same wires spliced into like yours

 

so if i understand, if my 16 has that, (what the OP found), i can buy that flasher for the 3rd brake light and it will flash when i apply the brakes?
if so, exactly what is it called, assume can get on Amazon.

 

I won't get into the reason for the splice, but, as a retired electronics/electrical engineer I can tell you that that is the wrong size butt splice for that gauge of wire ..... why it came out so easily. The crimping tool was also inadequate. Whatever person did it didn't have a clue!!!

 

Hahaha good ol’ “dealer”… thanks all for the quick replies. I always learn something here. Much appreciated!

 

Makes you wonder what the added dealership alarm wiring looks like.

 

Just a brake flasher module, something like this
https://www.ebay.com/itm/Flash-Stro...LED-Third-Brake-Stop-Light-Lamp-/323810732774