I promised to show you how I connected my 100A ammeter. Perhaps someone might be able to point out why it doesn't appear to work. Please excuse the scrappy (and dark) nature of this wiring diagram:
The thin wires to the display unit are connected to battery + and either side of the shunt.
On my diagram I added the connections to the inverter as an afterthought. Having done so I am now wondering whether the negative cable to the inverter could actually be earthed there, thus bypassing the shunt.
Whatever, the result of this wiring is that the boat electrics function normally but the current shown on the display unit never exceeds 0.4A, whichever way round I connect the thin wires to the shunt.
Any ideas, anyone?
7 hours ago