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Do you know that the batteries are fully charged? Low DC input voltage can do this. That can be checked AT the remote terminals and see. It can be the remote, but don't just buy one without some testing first. Be sure the terminals are clean and you might try some electrical "grease" in the plug to be sure that the power is getting across. A small digital multimeter is needed for testing. Please get back to me if you need more as all follow ups are included in our fee.