Did you say they sent you a second cable? Have you tried using it in place of the original? Sometimes cables can be bad. Who did you buy it from? The retailer might take it back and replace it.
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SO, is this the unit you are using:
Exactly how do you have the wiring hooked up? Could you possibly draw a simple schematic to show us your wiring?
Just trying to go back to basics to help trouble shoot the issue.
Just trying to eliminate things with this question, but you don't have the controller/throttle connected directly to the track as well, do you?