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?

--
Tciao for Now!

John.