The folks in this section linked below should be able to help you far better than the Lounge. My Cadillac isn't even supposed to have that many brake lamps.
You may also want to provide more information, especially the year and package of your CTS, as they come in hatchback, coupe, sedan and sport variants, which undoubtedly vary here or there based on which year.
Please use the settings and profile tabs to update your profile to reflect your approximate location, car owned, and time zone (Do you really live in London ?)
Thread moved to CTS. If that's incorrect (based on limited profile info) then ask a Moderator to move it to the proper forum for your car.
The search function will be very helpful to you. The third brake light has been covered many times with very detailed step bybstep instruction
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