I would recommend checking the voltage at the directional switches in the handle. When the lift is on and you are standing on both pedals you should see battery voltage. If you don't, check the presence pedal switch. If you don't have voltage there check the brake switch for voltage.
The way these older lifts are wired is it requires the switch in front of the switch to be closed, then it take the input from the handle to close the A1 contactor.
With the A1 contactor operating off battery voltage, it will most likely be an issue within that circuit.
TB1-3 on the control card sends voltage through the circuit. Then L9 is the reverse input and L10 is the forward input on the SCR card.