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I recently desided to put a new soundtraxx decoder in an old Athearn Challenger. The MRC decoder had been removed but the Loco has sat for several years. Does anyone know the pinout of the solder pads in the tender that are on the board that attaches to the Loco? Thanks? ...tj

First off which decoder you have ?,if you have the 8pin decoder board ?it should work ?without any problems . If not start by tracing the wires on the locomotive’s wires to find out where they go to and I would do this first before putting it on the track.