Making a stereo harness

[tater 10+ year member]

So heres my problem. my friend has a 1971 ford pinto. and were going to install an alpine head unit in it (among other things). to the best of my knowledge the vehicle doesnt have a harness for a stereo. Or any wires for a stereo clearly available. This isnt too much of a problem in my opinion. I can make my own. The constant power, and ground should be nothing to wire. however the accessorie wire is what im not sure about. where do i pull that from? What wires would only have power in them when the key is turned?

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[SOChris 10+ year member]

Maybe the cigarette lighter? I'm not sure but you could probably find a manual online or at the library.

 

[Jekku 10+ year member]

I'd try anyhting that powers up while key is in ign/acc position.