@LilahTovMoon He should use his meter to verify that he has ground continuity from the earth pin on the charging cable.

The earth pin of the socket on the vehicle should be bonded to the chassis - easy to verify with the meter.

This means the vehicle body should be connected to the local earth when charging - if it isn't then there is a wiring fault in the charger or less probably the bond wire has fallen off in the vehicle.

My money is on a charger wiring fault.