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[quote user="BigDaddy"] The PO said he had a LL GP20  It certainly could be different than my LL GP9. In cardiology, they call it concealed conduction, electrical pathways in the heart you can only imagine.  Maybe that's the case here but I don't see a second wire from my trucks. EDIT If the frame is the second (concealed) pathway, well I'm glad I brought that up before installing a DCC board, otherwise the kimchee would be deep. <img style="display:inline;" src="http://i1297.photobucket.com/albums/ag32/SirHenry3/Model%20Railroad/IMG_2763_zpsnoyt7gjz.jpg" alt=" " /> <img style="display:inline;" src="http://i1297.photobucket.com/albums/ag32/SirHenry3/Model%20Railroad/FullSizeRender_zpsisekphwg.jpg" alt=" " />   <div style="clear:both;"> </div> [/quote] Yes its a hot frame.  When I plugged the decoder into mine I did not pay attention to that.  Should be black wire running from both trucks.  Red wire is screwed into the top of the weight.  Engineers side if you are short hood forward.  On the Left hand side (short hood forward) is a red wire going to the lower motor connection.  This is how they get away with hot frame.   Both trucks provide power.
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