Hi,
The sensors tell the speedo what phase / coil of the motor (A / B / C) to fire by knowing where the magnet is in relation to the coils. So if you swap the cables the speedo will try to power the wrong coil.
It why sensor systems are smoother then sensor-less systems. Sensor systems know where the magnet is in relation to the coils.
MiCk B. :-)
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