Test Motor and Diagnose Low Voltage

What happens here

After reinstalling the hydraulic motor and connecting all lines and wires, the presenter attempts to operate the Genie lift. He turns the key on, expecting to engage the main hydraulic pump for full functionality, but the machine only operates on auxiliary power (a smaller, less powerful pump). This indicates a problem with the main hydraulic motor or its power supply. He checks the hydraulic fluid level, which appears sufficient. He then tries to "bleed" the hydraulic lines by loosening a fitting to allow air to escape, but this doesn't resolve the issue. He suspects a low voltage problem to the main motor, as the motor barely turns and sparks previously. He uses a multimeter to measure the voltage, discovering it's only providing 3.2 volts, far short of the required 48 volts for the main motor. This confirms the old lead-acid batteries are severely depleted.

Goal: Confirm hydraulic motor function and identify the root cause of power limitations.