@Train Nut posted:Thanks for the input. So where does the ground in the middle of the tube go to? Does it ground at some point to the wheels? Shouldnt I have continuity from the shoe through the coil to the wheels?
The accessory shoe rails on the uncoupling track are energized with center rail power when the uncouple button is pushed. This power goes through the rivet in the accessory shoe. The top of the rivet is contacted with a copper spring which conducts power to to the fiber plate on the rear of the coupler. One end of the coil wire is wrapped around this spring. The return path varies a little depending on the type of truck. The coil wire is wrapped up between the coil and the tube it is wrapped around. That tube contacts the coupler body. The coupler body is crimped to a plate that hangs on the axles. Wheels on the axles contact the outside rail. There are lots of contact points that might be a problem. I would use a wire to probe the various joints to see where conductivity is being lost.
