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am getting an erratic reading starting at 15 ohms and go to 55 ohms up and then down and then back up. Is that normal?
No! It should be a steady reading within the given values. I think you’ve narrowed your problem down to the sensor coil or its wiring.
Just a note but the wires tend to break internally where they make a sharp bend under the cover plate holding them down to the armature plate. The outside insulation will look good but the wire inside can be broken and hanging on by a string. This might give the erratic readings. Wiggling the wires or turning the mag plate with the meter hooked will usually show a reading all over the place if
a wire is broken inside and making intermittent contact.
Someone had this same issue here a while back and narrowed it down to a bad wire in this area.. I’ll see if I can find that topic and post a link to it.