recharge and test your battery just to make sure, disconnect those three wires, and start from scratch. isolate any mistakes, possible something setting on the brake lever leaving your brake light on? are you sure you turned the lights off?
Possible that you disturbed the battery cables in some way?
sounds like to me somehow how you took your battery out of the picture. whether the battery is bad,something wrong with the electrical system draining it or possibly just a bad battery.Or the cables on the battery are bad in some way where it is not really hooked into the sytem