Based on your measurements you should be having 48-52 volts not 33.3 volts.
8.4 x Six = 52.4 volts.
You may have measured the pack voltage from the wrong batteries.
If each battery is 8.4 you may have a bad wire connection or a bad micro switch on the lever style F&R switch the the 97 cart comes with.
Does the solenoid click with the key on and you carefully step an the accelerator pedal?
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