courtesy lights

I am trying to put in footwell lights in a 1985 Toyota Corolla GT-S. Some how I can't find a +12v when the doors are open. Where can I find the +12v that turns on the dome light? The doors are negative trigger so it is 0 when the doors are open.

Depending on how much current the lightbar pulls, it may be better to +12V from the fuse box or better yet run a dedicated fused wire from the battery Than you can use the door trigger for your switched ground

So hook up a relay and use the ground as the switch?

If it's low power (under a few Amps) and it is a normal earthing switch (with no sensing or other circuitry between your added lights & the switch), you should not need a relay.

So postive from the leds to a constant 12v then the ground into the door switch? Wouldn't it short once I close the doors because it will apply both 12v from the positive then 12v from the door switch?

What short? That's 12V to 12V. And it's not a short - the LEDs are in between.

Oh yea, wasn't thinking. I got them wired up now like that thanks!

You weren't thinking? At least you have an understandable excuse. I do think and I still make similar silly's! What's worse is that I've worked for telco's that typically use +ve ground for traditional equipment so you'd think I'd be used to "inverted" drawing switching. Yet I still have to think carefully about your situation. (Even though I have oft decribed the benefits of ground switching as used in most digital logic etc - aka Open Collector outputs.) But these simple things are like a genius tying shoelaces - too trival to learn, or in out case, to waste our genii on. Cheers.