I am installing Greasecar kit, and I need to know which wire coming from my ignition carries 12V. Any help would be greatly appreciated.

I am installing a Greasecar kit and need to know which color wire coming from my ignition carries 12V. Thanks to anyone who can help with this!

Well, I know you are going to hate this answer....
but use a volt meter to check the wires and also
decide if you want key on 12v or 12v constant.

You have choices on this one.

Are you powering a gauge or more than that ?

Typically red is hot with key on, honestly I'd have to check to
be exact and there are a few choices there.

For accessories and extra power I look to things like cigarette lighter wire
it is hot with key on.
There is also a way to tap the fusebox directly.

__________________
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250