737NG - quick ground power

[Guest JTH]

On the NG, when the ground power light is on and I flick the ground power switch to "on", is it supposed to flick straight back to off again even though ground power has been enabled? What I mean is, is it true to say that when it is on, the switch doesn't actually REMAIN in the "on" position?If this is the case, how do I turn off ground power when I am ready to start the APU? Seeing as it the ground power switch always pointed to "off" anyways, do I just flick it to "on" and let it go back to off again to turn it off? Thanks in advance for any help and hopefully this question isn't too confusing!Regards, Paul.

[Guest andyman]

There are three positions to that switch. Not on and off. It is like this.Disconnect power from electrical system.Does nothing(when the button is unused.Connects the ground power to the electrical system.If you were to click slightly above the switch itself, the mouse should turn to a hand and the ground power should disconnect.Turning on APU power would disconnect ground power anyway.

[Guest JTH]

Thanks!