Question On TMCC and Stalling Engine (Bad Board?)

[dougdagrump]

One of my C-420's was acting kind of funky when crossing the turnouts on the club layout so I set-up a test here at home. I placed a short piece of electrical tape on the center rail and approached it slowly with the problem loco, one pickup crosses it with no problem the other rolls onto it and it dies. No lights no nothing, I checked for continuity between the rollers and it checks ok. [%-)]
Any ideas ?
At least the ones that can be posted for a mixed audience.

[wrmcclellan]

Doug,

That is interesting. I would still diassemble the rollers and check the wiring continuity. Maybe the first roller in your example is losing electrical contact when it is compressed when on the track so when the second hit the tape, power was lost.

Both rollers will have a separate wire to the TMCC boards and use either a wire nut or they will go directly into the little white connectors (called JST connectors). You can pull the connectors to isolate the roller wire for the continuity test.

Regards,
Roy

[dougdagrump]

Roy, I think you may have just diagnosed the problem. I took it off the tracks and used another transformer and jumpers, both rollers functioned independently of each other so I put it back on the track w/o tmcc on and it did the same thing. Hit the tape and died, so I'm going to try tracing and check the roller connections.