Turning laptop on/off using a switch and P2140
I've read up on the P2140 and seen a couple of videos and I think I understand, but I have a couple of questions.
I'm basically wanting to power my laptop my turning the switch on, and away I go.. Simple as that, no ignition turn on or anything like that.
Anyway, first question is, on one of the wires on the P2140 it is used for telling the PSU the car ignition is on OR a switch is on - once this is on, it provides power to the laptop - correct?
However, if I just plug the power into my laptop, it doesn't automatically power on. So I'm going to need to extend the switch from the laptop to the car - correct?
If I'm right in what I've said so far, if I want a switch to turn the laptop on, then I will need two switches? One for the PSU and one for the laptop? - If this is correct, then how can I use one switch instead!?
Thank you! :)