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This is most often caused by a faulty 24 Volt, section, (usually damaged output semiconductors, or the drive?) in the speed controller, fault, the only "Fix" is replacement. Simply obtain the entire speed controller and replace it "En Bloc" as it were. You will need to also obtain a service manual so you can disassemble it and obtain the parts numbers for the replacement parts.Otherwise take it to a professional and ask for a "Quote" as to prospective costings and go from there.
the black wire goes to - and the red goes to + for 12 volts. If you want 24 volts you need to add another battery and run a jumper wire from the - of the first battery to the + of the second battery and hook the white wire to the - of the second battery. Here is a picture to help you.