The problem is at the connections. For two contact LEDs most of the the manufacturers use a resistor to dim the light on tail light mode while in a regular bulb two different filaments are used.
For that reason if we don't use a diode at the brake light end some of the positive voltage (here 7-8v) is found at the brake light end as if we apply brake.
I see, I have not messed with any LED bulbs. I knew tail lights for trailers etc. used that kind of set up.
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