i know i've asked this a million times, but i'm so frustrated by it..no one can help me..so i'm asked one last time

i got a led light i want to wire to my car. when the key if off the light goes on.
it has a pos. wire,
neg. wire,
ground wire,
and white wire which can hook up to ignition.

I tried hooked up the pos. and neg. to my cig. lighter ( which i thought was always constant) but that didnt work, b/c the light only came on when the key was on. ......and i'm not going to wire it directly from the battery.
so yeah.....someone told me remote line i can use for a hook up, but i only thought that remote line to the amp worked when the key was turned on..
so can someone tell me how to do this all...probably so freaking easy.!

 

do u have a secuirty system already installed? if so you can use that.

 

what car is this? year model?
get a relay, SPDT relay from www.partsexpress.com 89cents each

wire it in this order:
85-ground
86-acc wire or ignition
30-one of the wire (the other one ground)
87a-12volt constant.

this way, the LED will turn on when key is off, on when key is on.

good luck!!!