Originally Posted by jeff_man
basically i want a 12v line that is always on,
Well, the "best" location would be the large white wire at the alternator, as that comes direct from the battery. There's also the blue/red wire at the back of the radio, which is 10A at the "ROOM" fuse.
I'm puzzled, though, as to why you want something that's always hot. The most optimum solution to this problem, IMO, is to take power from a circuit which is hot in RUN but not in START.
In my car, I took a feed from the blue/black wire at the back of the radio and used that to drive a SPST relay. The relay takes power from the battery, through an inline fuse, and drives the LC1 & XD16.
Now, technically this circuit is hot in ACC (rather than RUN) which means my WBO2 is on anytime I have the key in the first position, but for me this isn't a problem. A better location might be the pink wire at the back of the climate control panel- I'm pretty sure that one is hot only in RUN.
The key point here is that the LC1 is disconnected whenever the starter is turning, which prevents it from seeing marginal power.