Harry Bloomfield wrote:
John Williamson presented the following explanation :
Harry Bloomfield wrote:
Remember the old type charge / discharge ammeters, where used a
couple of turns of cable which used to sometime be fitted to vehicles
? I have one fitted to the tractor mower which is not marked + and -
and I'm sure it reads the wrong way. The needle goes left when on
charge, I seem to remember the norm is to move to the right.

Can anyone remember, before I take steps to correct it?

My Lard Roller ammeter is marked - to the left, + to the right, as
have all the others I've used. Has your tractor mower been converted
from +ve to -ve earth at some point?

No, it is not that old - I suspect the coil windings (2 turns) were
simply fitted the wrong way and it has bothered me since I got it.

Is it fitted upside down?

Bill