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Dear John,

There are plenty of articles on the web describing this type of wiring. See Electric Nose for some good examples with photos. The important text is :-

"The core principle of lighting under DCC is that the blue wire (actually called the common positive) is connected to a resistor that is in turn connected to the 'anode' (positive side) of the LED. The other terminal of the LED, (the 'cathode' or negative side,) is then connected to the function wire of your choice to complete the circuit. In this photo the white wire has been used, which is the first function and most often used for headlights. Pressing the matching function button on your DCC controller will switch this function (and hence the light) on and off. "

From your post, it sounds like you have connected the LED to the motor wires (red and black, if you are following the DCC standard). which does not sound like the above description.
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