i believe the light in the switch is only a l.e.d. they draw like nothing for amps or voltage. if you want to know for sure.
disconnect the power to switch
pull pos. off battery insert multimeter between bat & pos. wire
this will tell you voltage draw (amps or volts depends what you select)
then connect power to switch and repeat the process.
if less than .1/.2 amps you have nothing to worry about
you can have a 1/2 amp or better draw overnight and won't kill battery unless your battery is a piece of s**t
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