Kia Troubleshooting Questions? Ask a Mechanic
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
The 3rd brake light is wired direct to the brake switch on the pedal, it does not go through the turn signal switch or the flasher relay. Can you apply the brakes and see if the bulb socket is getting the needed power and ground meaning its just the bulb to blame.
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I would imagine this add on flasher would be installed near the brake pedal or the 3rd brake light wiring. I doubt its hidden anywhere else in the harness.
To get to the 3rd brake light you remove the rear seat back and the package tray to gain access. I sent an offer prior if you need me to upload manufacturer steps.