Who is Mark!?!
Cranking is the engine turning over before ‘firing’ and running… the ‘wer’ bit of Wer, wer, wer, wer, wer, wer, vroom!
IIRC = If I Recall Correctly…
If you watch the video I posted, it shows you the 3 wires. One is the 12v supply (you don’t want that one). One is the earth...