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Do you have a small digital multimeter for some testing? That would be the quickest way to track down the problem. About $20 or so and easy to use and I can direct you in this. Let me know.
If you have a meter and know how to use it on checking DC voltage we can test and see where the problem is. If you have good voltage on one side and not the other and it is not off....then good chance it is bad.
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?