silvia240sxpimp

My passenger low beam stays on even when the headlights are turned off. Only when I remove the drivers side headlight fuse the passenger low beam turns off...Very strange and annoying seeing as how I can't leave the passenger low beam bulb in due to the fact it would stay on and run down the battery. Could it be my relay?? I hooked up a voltage reader to the passenger low beam wires and it reads 12.4 volts even when the switch is turned to off. What's going on here!!! I have a Silvia front end but I hooked up one of my pop-up bulbs I still have and it stays on too. Help!!!