The electric brake being activated is hard to diagnose without a programmer device reading a fault code, but for safety sake you should remove one terminal from the batteries to avoide any extreme discharge of the batteries. There is obviously something causing the brake lights to remain on that in turn activates the motor brake and brake lights.
I don't know what your level of machinical skills you have and I am reluctant to suggest any further testing with a 48 volt cart.
Again removal of battery cable, if not confident get help, the electric brake being activated at this time will produce a reasonable spark when
Removing wire from battery. After removing battery wire slip end in a glove before laying down.
Be careful,
Frank
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