Best Place For 12v On?

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Just wondering where the best place to find an 12v source (in the dash area) that is on only when the key is in the ON position, not ACC. Cigarette lighter is on the ACC circuit. Its just to run a relay coil, so it would not need to be high current tolerant.

What are the wire colours on the key barrel? Also I have an aftermarket alarm/immobiliser fitted. Im not sure how that will affect anything.

[Trex]

I would also like to know this.

[GTofuS-T]

The cd player has direct power to it I think yellow wire from memory

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Well I came up with a solution. Here is the wiring diagram for an s1 stagea:

Its a bit unorthodox, but I have a relay wired directly to the battery which is activated by a 12v feed from the A/T power/snow switch. It was in the location that I was working in, and the 12v only comes on when the key is in the on position. Also its on a 10amp fuse, so running a relay coil shouldn't be a problem