[9fourteen]

i found the DME plug. I tested there and get a 2.2V pulse out of the reference sensor on the oscilloscope. I would conclude it is working. The resistance on the reference sensor also tested up correctly between pins 25 and 26. Not sure why I wasn't getting resistance at the sensor itself.

I still get nothing out of the speed sensor. starting to think that is where the problem is. I traced through. It doesn't look like any broken wires but might be internal somewhere. I'll check continuity next.

I am guessing that power (or ground) must be supplied on the third pins, labeled 23 and 78 on the holder (Clark's diagram) and without that connected up I was unable to test at the sensor itself. I would also assume these pin, 23 and 78 must go someplace else other than the DME plug since there is not a 78 pin on the DME connector.

I think I will order a couple sensors. swap the one and keep a spare for future. Hopefully that will do it.