This charger, although old, is a bit more complex and requires a voltage from the battery (36 volt, or so, if depleted) be connected to it before the sensing circuit will close a relay on the internal PC board to allow the AC into the transformer primary.

That is why I need to confirm that the charger output leads are White for Positive and Black for Negative before I go attaching them to an actual bank of 3 large 12 volt batteries and burn up the charger if the polarity is reversed.

I had hoped that someone either had an old EZGO cart with the "Total Charger" unit or even had a schematic. I guess I'll keep hoping.

Thanks