If its 6 volts it was probably Pos ground when new although the genny can still charge at EITHER polarity once Polarized while ammeter leads needs reversed or else it would read backwards.
Once you get it wired right and decide on your polarity (Id stay at Pos if its 6 volts) be sure to Polarize the genny BEFORE starting.
Once thats all done heres a Troubleshooting Procedure for non charging
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