I added a spare tire brake light. I also added an LED flashing third brake light.
The third brake light flashes fast - 3 times then stays steady.
The spare tire light flashes fast - 3 times and then flashes slow 4 times and then stays steady (as long as my foot is in the brake).
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@rootleaf
So where did you route the wires? I have one I need to install but don't want to drill a hole if possible.