I tried another floppy drive and same results. But i noticed some traces look damaged. Don't know how as there is no battery on this old REV 5 A500.
I had paid 2 Euros for this Amiga from a carboot sale. It is very very dirty, filthy, dusty and the RF shield is all rusty and the floppy drive has corrosion (not rust). It must have been stored in a very damp place.