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Most of the time this is a tripped shortstop breaker which would usually be found near the batteries. I am attaching a link to a photo of one. Push the black button back in to reset it. Sometimes they have more than one and a red cover over them. If you have a small digital multimeter this is a lot easier to track down. About $20 or so at most hardware stores and easy to use. Try that and get back to me if we need to dig deeper into this. All follow ups are included in our fee. http://www.surplus-electronics-sales.com/images/medium/122-1012%20Short%20Stop%2028V%2030A%20CB%20sm_MED.jpg
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?