title says it all i need to know a wire thats in the engine bay that i can tap into that supplies 12v but only when the ignition is on. thanks 
you can just use the free pins in the under dash fuse box.
What do you need it for, [load]?
Do you need “true ign.”, [hot in run and start] or “2nd ign.”, [hot in run but not start]? :hmm: 94
its for my rad fan, its on a switch now, i want to use a 12v when ignition on only instead of the constant 12v i’m using right now (yes i know thats bad lol) so that way when i have the switch on if i forget to flick it off when i turn the car off the rad fan doesn’t keep going and kill my battery. my switch is breaking the ground.
OIC, so the question is why are you using a switch to control the rad fan?
Anyway you could use the black/yellow at the rad fan relay.
That’s got to be a big ugly switch, [15A] you are using to control the rad fan, why not just fix the problem you are having, or at the very least use a small 1A switch to control the rad fan relay?:hmm: 94