The car starts easily, seems like it’s getting plenty of current, but I notice the battery is connected negative to earth. The ammeter operates backwards, needle moves to left when charging indicated. The coil is connected positive side to distributor, from what I’ve read it should be negative to distributor if the system is connected negative earth? If I leave it negative earth to fix the ammeter is it just a matter of changing wires from side to side? Any other issues with polarity negative earth?