High side switch won't turn off
Ran across this same issue recently, a voltmeter will not provide enough load on pin 3 output to turn off(floats at 10v) with a low on pin 2. Connect a 10k resistor from pin 3(load)to ground while monitoring this with your voltmeter send a logic high to pin 2 then a low to pin 2 and you will see that the output will turn on and off as it should.