Quote:
Originally Posted by wazzz
If no resistance reading at the sensor, that may be because the axle is in between two of the eight magnets. To rule this out you should maybe try to rotate the wheel while testing the sensor resistance, or continuity since it is only a reed switch that closes 8 times per wheel turn as it "sees" the 8 magnets passing by.
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^^^ +1
Need to rotate the wheel one full turn and check that the switch closes the correct # of times. Apparently not unknown for one or more magnets to go adrift from the carrier. Or even for the carrier disk that holds them to break entirely.
But without rotating, could simply be that the switch is just between two magnets. You should get a square wave out of this when the axle is rotating (one side is power, the other is the speedo input signal).
If you still get no continuity while rotating the axle, pull the sensor and put a magnet on it to confirm. Replacing a dead reed switch or bad wiring would be a big win, as opposed to replacing the carrier disk...