Sounds like the existing hot wire itself or a connection is bad on the existing wiring. If you can find either ends of that wire maybe you can "buzz" it out using a meter and see if there's continuity (make sure it's disconnected at either end so you get no interference from something else).
If you don't know how to do this, let us know. If this is the problem, you're gonna have to find out where the break is located, disconnected, or bad. Maybe just rechecking this wires connection will fix it if it was loose.
If this is not the problem, then it's gonna be tougher to debug and I hope someone can help with that one.
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