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Reply to "Runaway TMCC Soo Line SD40"

That's what makes me think it might not be the magnet ring.  Another thing to check is if the flywheel is loose on the motor shaft, I've seen that a few times as well.  Also, the connection between the motor sensor board and the DCDS could have a break in the wiring.

I’ve seen that too John, …..good catch!…

Pat

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