Trailor Brake ligths - not working

[pieusu]

Need help. I had an aftermarket trailor put on.
I know there's a Kia recall on trailor brake lights not working. My dealership says they have fixed the recall.

My brake lights on trailor still dont work (all other lights work). i have brought the car to both the dealership and the trailor install company 2x..
Each are saying the issue is with the other party.

Kia Dealership says the aftermarket trailor harness may not be campatible. Is there any truth to this? Any help would be appreciated. Thanks

 

[2020Telly]

Tough to help without more details. Do you have any part numbers? Pictures? Receipts? Do you have a 2020 or 2021? Did you have a 4-pin aftermarket or 7-pin aftermarket harness installed? What are you towing? What kind of lights?

You said the brake (stop) light doesn’t work, what about the tail lights?

Your problem may require tracing out the wire for pin #4 (of the harness connection):

Towing

Hi - I know there are a lot of threads here related to towing. I recently purchased my Telluride and am looking to hooking up tow hitch so I can eventually purchase a small camper trailer (likely less than 2,500 lbs). I've read on here that the tow hitches I can get at the dealership are a...

tellurideforum.org

For the 4-pin there are two aftermarket harnesses that are plug and play with a 2020 or 2021. The two aftermarket have a higher Amp rating than the Kia branded one that may have trouble if you have many lights.

For the 7-pin you must go aftermarket on the 2020. If done properly it should only be a couple splices. But if you got a universal 7-pin installed that requires more splices, so you need someone who knows what they are doing.

For the 7-pin on a 2021, the same above applies, except that there is a Kia plug and play option.