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Levi, an Ammeter is almost like a dead short circuit, an "Ideal" Ammeter would be ZERO ohms across it, but they cant make em that good lol. Its basically a pass through current measuring device, not so much of a voltage device. Typically, the SUPPLY terminal has BUT ONE wire (cigarette lighter may be an exception) and thats the main hot battery voltage feed source, often via a wire to the starter switch where the big hot ungrounded battery cable is attached. Its other LOAD terminal is what supplies voltage to loads like lights and ignition PLUS it wires to the gennys output (via a cutout relay) so the genny can get to and charge the battery by pumping current into it through the ammeter. Its important that the SUPPLY terminal wire to the battery/starter BUTTTTT TTTTT alllll lll loads PLUS the gennys output wire to its other LOAD terminal. If you wired a load over on its SUPPLY terminal, it would still obviously work (theres hot battery voltage present there remember) BUTTTTT its current wouldnt be passing through the ammeter so it wouldnt register its use. For the ammeter to correctly read the net current into (charging) or out of (discharging) the battery, the battery needs to be on one side and the loads and the gennys output over on the other side. So the loads will work if wired on the wrong or either side of the ammeter, but for the ammeter to accurately register net current into or out of the battery, it must be wired as I described. If its wired in reverse it will still register, just bass ackwards lol. Hope this helps, best wishes n God Bless John T
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