Hall Sensor Question

[Scottie-GNZ]

Just finished up an RB25DET/MS3X install and cannot get an RPM signal. I have full confidence in my wiring and the msq is a copy of one from a running setup. The CAS is suspect and the MS3X will probably need to be opened and tweaked. I am not interested in pursuing a solution for the CAS setup, so I am taking the easy way out on this and installing a 36-1 wheel with a hall sensor.

From the CAS wiring I have sw12V, chassis gnd, and the shielded tach/crank wires from pins 1 & 24. Pin 24 goes to the sensor white and the sw12V goes to the red, but my question is this: Is there any advantage to using the chassis gnd over pin1 in the shielded wire for the hall sensor gnd?

TIA

[Matt Cramer]

A chassis ground would likely be worse, not better. There's a chance of a voltage offset between the MS ground plane and chassis ground creating noise. Grounding the sensor to the MS3 would be better.

[Scottie-GNZ]

Thanks, Matt.