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That sounds like the battery disconnect solenoid. And when you want the batteries "in the loop" you need power flowing through that. Perhaps the switch is not in the correct position. You want to hit "use" on the control button. Check that first and then get back to me if we need to do some testing. All follow ups are included in our fee.
Just checking back in to see if you were able to resolve this or do you still need some additional input from me here?