Hi, you are describing a problem that I think is related to the wire harness, a wire touching another wire because the insulation is damaged, then you get "Organ" of lights.Was the issue solved , im facing the same issue with the speedo light , tail light and number plate light, when both the brakes are pressed all the 3 glow.
Usually the insulation is damaged for one of the following four reasons:
1. Due to poor design, the wires are worn by another mechanical assembly that moves next to them and touches them. This is probably not the case this time, there are no known problems of this kind in our model.
2. The original insulation was damaged due to careless installation of accessories.
3. Hungry rodents that like to crunch electrical wires.
4. Loose contact in the connector that transmits a lot of power. It usually happens at the connector that comes out of the three phases of the stator (as happened to me this week). The loose contact causes a lot of heat. That heat burns the plastic of the connector, burns the wires insulation. And if you don't stop it, the heat will burn additional wires that are tie up near the wire that got hot, because they are tie together at the wire harness.
And there is also the good advices of jky357 and I copy them here as well:
Check the fuses first, but from the sound of it there may be a ground issue that's causing the problem - like a pinched wire or bad connection on a ground.
Check all of the battery connections and confirm that you have a battery that will hold a charge. It should be over 12.7V before cranking and 10 to 11V during cranking. When running it should be over the voltage you got before cranking (13.1V) or there is a charging issue.