Hall Sensor Location?

[DBF]

Hello All,
I drove my 1982 Coupe for the first time in about a month this morning and about 2 miles from home, I down shifted while going through a school zone, and the old girl died.  I parked it in the school lot, got a lift home and returned to do some diagnostics. 
I had fuel, but no spark.  I disconnected the Hall plug from the dizzy and found I had 2.5 volts.  I immediately suspected the Hall sender, so I returned home to get a spare I had in the shed.  I returned to the school parking lot, figuring I'd swap it for the one in the car.  Imagine my surprise when I went looking for it (as described in my Bentley) and it wasn't under the plastic shield covering the wiper motor/vent air intake!!  Where the hell did it go!!
As a side, I towed the bugger home and pushed it into the garage.  After taking a few more voltage readings, I thought I check for spark again.  While I was turning the car over, a nice blue spark was showing and the car started!!  Evidently, whatever stranded me, righted itself.  I despise self correcting faults. I am leery about the Hall, and I am going to check it.  So, any ideas where it might be hiding?

Thanks, 
 
Dan