Why my brake light only works on 1 side

My brake light only works on 1 side after installing aftermarket rear fog lamp. The way I did was, I tap the brake wire direct to the fog lamp. Red wire to existing red wire and same on black wire. The fog lamp works fine but when I press the brake, there is no lights at all on the fog lamp tap wire side. Did I miss anything?

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4 Comments:

explain this " I tap the brake wire direct to the fog lamp." Is that the side where you tapped in?

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On the left side tail light, there is 3 wires plugged to the socket. I splice 2 of the wire which is black and red and leave the green wire alone. switch the lights and it's working but when I brake, there light go off.

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Okay, did you splice the brake light or the tail light?

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The tail light

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