V60 2012 D2 electrical issues help please!!!

[Kcapeling]

Hi everyone, I have a a D2 v60 2012. A month ago I had ‘stop start service required’ pop up. Checked voltages all ok, albeit noticed battery charging voltage was just over 12.3v. Charged the battery and the charge voltage increased to 13v. No faults showing.

A week later I got ‘injector fault come up on an obd reader’ cleared and didn’t return.

2 days later driving home I lost all function of the car, steering went heavy, dtsc light on, centre console all went dead.

Got home battery showing 11v. Charged again everything came back on but no charging.

Got a new alternator fitted still no charge but did find the main ground cable arced on its mount. Replaced.

On next start up, wipers won’t turn off, lights are all out on left side (until started then headlight come on but opposite goes out) no indicator control, electronic brakes won’t release but car starts fine.

I noticed tonight having checked every ground connection there’s no voltage between alternator B+ post and negative but is between B+ and Positive battery terminal… surely this shouldn’t be the case?

I’ve looked at the other end of the alternator cable (which checks out fine with no resistance and good continuity) that the joint on the stop start fuse connector also has 12v going through it when checked between there and positive but nothing to earth which I assume should have been the case.

Any ideas what’s up?
I’ve just bought vida but have multiple communication issues coming up so assume there’s a current trend or it’s the CEM but surely that wouldn’t have a bearing on the alternator reverse power situation?
Thanks for any help.