1973.5 wiring question

[Francois007]

Hey guys been recently just installed cleaned fuel injectors into my 73.5. And as I was installing them I noticed this wire that’s not plugged into anything and I can’t figure out where it goes or what it’s for? The wire is live and shocked the heck out of me

[gerakroo]

What is the color of this wire and were does it come from ? In that area , I would expect: Supply for license plate lights harness (grey) or Grey-white to top of fuel filter ? The yellow-red wire is not original for sure.

[Zuba]

It may be a cold start wire for mfi cars. I’m betting it wasn’t used on 1973.5 cars as mine has the same wire, I didn’t check to see if it would shock me.. http://forums.pelicanparts.com/porsche-911-technical-forum/621370-engine-compartment-wire-problem.html