OK, if the ammeter moves toward the + side (charge) when there's an electrical drain without the engine running, swap the wires at the back of the gauge. There should be one wire from the voltage regulator to the ammeter, and another one from the ammeter to the ignition switch, both on the same terminal. The opposite terminal on the meter should have a single heavy-gauge wire, (about a #10) running to the battery cable connector at the starter. As current goes from the starter cable to the ignition switch or lights, (engine off) the ammeter should show a discharge. Once the generator kicks in, there should be a charge indicated on the ammeter.
Jerry
