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Battery Charger Circuit

Hello everyone.

I have a 24 volt charger from an Ortho-Kinetics Triumph scooter, that I'm trying to use to charge 2 12v batteries in series.

The charger plug has 2 large pins which I assume are for the main charging current,

and 2 smaller pins, which I suspect are for some sort of interlock or charge rate control circuit.

The charger will only put out 22.5 volts at a low amperage, from the 2 large pins, when connected to the batteries. I don't want to do the wrong thing playing with the 2 smaller pins, and risk blowing the charger out. Does anyone know what the 2 smaller pins need to be connected to?

Any help greatly appreciated.
 

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