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Sorry for bringing up an old post. I am having a similar issue. I installed the phastek 4th brake light kit using the tap connectors supplied. It has been installed for years. I havent noticed any issue the whole time. I recently realized it wasnt working.
Assuming a burnt out bulb I bought a new sylvania silverstar bulb which is what the kit came with. Still didnt work. I purchased a harness that connects to the brake light that has wires coming off to connect to the 4th brake light instead of taping into the stock wiring. I removed the old connectors verified only insulation on wires were damaged and shrink sleeved over the exposed portions and reinstalled with the new harness. Light worked again.
I then noticed that when I hit the brake it dims the clock and turns the aftermarket head unit backlight on. This seems to correct if the headlights are turned on. I removed the wires from the new harness and it fixed the problem. I then removed the bulb and this also corrected the problem. I tried the second bulb in the package and even the old bulb and had the same issue with them all. Is there a special bulb to use to correct this issue? Or am I stuck living with it or not having a 4th brake light?
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