Ignition module failures

canyncarvr said

The last two I've bothered looking at after they quit had at least one similar symptom: The distributor + pin measured short to ground (case).

I'm curious to what extent others have found that to be true. Anyone bother looking at failed modules with a meter to maybe find the same issue?

Thanks for the input!

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I haven't looked at the circuit diagrams. Not even sure I'd fully understand them. Distributor wires are simply pulse signals that are amplified. I think that's the big transistor.
There's at least one general explanation and photo of the circuit board in the master tech series. Probably for the 5 pin version but same concept.
Here's one: 1972 Imperial & Chrysler Ignition System Service Book (Session 292)

The only person I know of whose delved into the failures and publicly posted them is Nacho on Moparts, FABO and Dodgecharger.
Text has survived even though his pics have not.
Working on fix ECUs... AND FIXING WITH SUCCESS!!!