Unfortunatley I can’t teach you how to read a circuit diagram in a forum, its far easier to teach this from a video or in person. Equally unfortunatley you can’t just guess where wires go either, it may well be a rectifier wire, but you need to identify the location of the rectifier first and look for the same wire there, presumably disconnected! To be 100 per cent sure you need some form of meter /Ohm meter to confirm the wire is indeed the same wire at both ends. Regretfully waiting for a V75 owner to chip in with a bit of advice is in my opinion will be a long wait, the forum is relatively quiet these days with few members posting let alone replying, there’s a few regulars like Snakebite and Drewpy and myself but If there were any V75 owners they haven’t replied to any of your previous posts either!!
I think your best bet is going to be asking over on the facebook site , at least you’re going to be conversing with someone who actually has one! They should be able to help.
Obviously we don’t want to see you go, but if you can let us know how you got on it would be of some help to others with a similar problem.