e30 motronic wiring question

[Guest FrantiC]

Almost fixed the wiring mess in my e30, Just need to figure out something with the engine loom now.

I have figured out that the green ignition wire from the key goes directly from the key, through the fuse box, straight into pin 7 of the c101. Then from there, on the engine side of the harness, it splits into 2. 1 big green wire and a smaller green wire.

The bigger one powers the +12V for the coil.

What does the small green one do? I have checked wiring diagrams and it says just +12V coil power, but the other one Must do something somewhere?

I have checked relay pins and o2 sensor power but none of those are green or seem to be joined to it.

[pureboiracer 0]

um from memory it powers up your ignition relay, one of the three relays located by the air flow meter, it wont go without it hooked up.

[BM WORLD 1258]

might go to the diagnostic plug .