No spark and i can only get 5V at the coil.

People want to help.
I done figured "someone" would post the diagrams.
A picture is worth a thousand words.
Your car has had God knows what done to it and can drive everyone nuts.
You first.
Like the man says, it's simple
The wiring is simple.
But theory is something else. But then again he knows juicetricity.
Trying to figure out what is happening can be overwhelming if the poor guy doesn't understand the theory.
Make it look like his prints and go from there.
Unfortunately, you may have some extra "work" to do that.
But you will know what you have done the road.
My best "advice" and worth what you pay for it.