Ford cmax

[FPU]

Hi, I have a ford cmax that's got the battery light on. Have had 3 new alternators and a new battery fitted but the light wont go away. All voltages are correct as I've had them checked by a mechanic and the battery is still getting charged. Any ideas what could be causing this? I've scoured the internet non stop for the past 4 hours to try and figure this out but cant so any suggestions would be appreciated. Thanks