It now runs fine on "clear" track but stops on switches, remote sections, etc/
Hello, I've attempted unsuccessfully to repair a K-line switcher's intermittent, sudden stopping or reversing on my layout. It works perfectly on stationary test stand. The problem started after I replaced a broken off coupler. I thought I might have broken a pick up wire, but don't see one. Also, the "buttons" for uncoupling, touching the track; I covered them with tape for a test, but the problem continues. Any thoughts.
Fred Crider