During day time , or when the headlight is OFF : Apply the brake => the tail light (filament) lit up, which is incorrect and also not bright enough.
Night time, or when the headlight is ON : Apply the brake => the tail light (1) which was ON , goes OFF. Result => no tail or brake light.
Wiring was not touch and looks fine. Where is the short and what can be the cause ? Can someone point out the possible cause ?