You can test the Hall switch by itself installed or not, using a 9V battery and a small lamp such as a warning lamp from the instrument panel.







I dug out the dizzy from my 84 and gave the removal/replacement procedure a test. Cee Bee has a good point going at it from the bottom. My trigger wheel was thoroughly bonded to the shaft by rust. I'm quite in awe over your success, Mark, in removing it with liquid wrench and perseverance, so I tried to follow your lead this time.

After some soaking, I was able to remove the trigger wheel and the Hall switch assembly by holding the trigger wheel up with a screwdriver and tapping the shaft down through its axial play.

My dizzy is the 003 version as I imagine yours is.



Same sensor assembly too:



Getting that trigger wheel loose was the challenge.











And like you, I don't see any easy way to replace just the electronic part:



--
Art Benstein near Baltimore

A jumper cable walks into a bar. The bartender says, "I'll serve you, but don't start anything."