I am trying to troubleshoot an issue with the front LED headlight on my N N&W Class J 4-8-4 loco. The LED works fine when tested, but when installed on the loco it does not light. As the output to this LED is through the 6-way connector, I assume the logic for this light is on the tender circuit board. I am looking for a schematic and/or feedback from anyone familiar with this issue. Any help would be greatly appreciated. Thanks.