Okay, this is why I ask since there are many drivers that can fit the L6.
The stock FX-30 driver has no proper output for side switch lights. On this one you have to power your switch lights from a constant power source such as the positive lead going to the LED. You also have to make sure to add a resistor to reduce the voltage. The switch light will turn on and off with the tail switch. Look at my L6 and Mini L6 links to see how I wired them. It is not too hard.