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I ended up taping both the motor clips and the frame under the motor on my GP38RTR, since I couldnt find the source of my fried decoder.  I suspect that the leads for functions 3&4 (green and purple) came into contact with either the frame or the right rail leads from the trucks.  Both the leads from the trucks and the unused function leads have been taped.  I noticed while on the programming track the decoder made a chirping sound when commands were sent to it. Decoder type NCE D13SRJ. Is this indicative of a short? Also do the frame screws come into contact with the motor?
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