12v accessory wire

[dt8068]

one in the plug for the alarm

Doesn't the alarm always have power? I only want 12v power when the ignition is turned on.

why do you need one BTW?

I need one to wire a relay so that when I turn the car off, my power inverter shuts off. The power inverter is wired directly to the battery.
This is for my car pc.

[doogie]

Doesn't the alarm always have power? I only want 12v power when the ignition is turned on.
I need one to wire a relay so that when I turn the car off, my power inverter shuts off. The power inverter is wired directly to the battery.
This is for my car pc.

Is your inverter a temporary stop gap measure or a permanent solution? You would be much better using a proper car pc power supply which will do 12v (and normally 5v) regulated - mine does 19v for my Mac, 12v for my screen and 5v for my USB hub, whereas with an inverter you're going 12v -> 120 or 240 then probably back down to 19 or 12 which is not ideal!

For a proper supply you will need an acc live though anyway if you want to do auto power on and off.