a serial number (series) would help in knowing what the possibilities are.
without a serial number I would guess you have a battery and battery corrosion problem. Pull the battery and get all the corrosion out from the area under the battery, and replace any power cables that have been sitting in the corrosion.
Also, while the battery is out, blow the motor and contactor panel clean.
also check the brushes in the power steering motor, if it is not an AC motor, and check the contactor tips
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