what did you want? one that's only on when the car's running or one that's on all the time?
if i were you i'd just go to the ignition harness under the dash and make sure to fuse the wire. here's the colors for both 12V and Accessory:
Or, if you wanted it to only be on when the Key's in the "Run" position use the Green/Yellow stripe in the ignition harness.