How To Test A 4 Pin Gm Ignition Module. Pertronix D72000 Flame-Thrower HEI III 4 Pin Ignition Module GM 43 out of 5 stars 25. The typical ignition system circuit diagram for the 1992-1995 43L 50L and 57L 1500 2500 3500 Pick Up and Suburban can be found here.
Each circuit is identified by a letter and this is the same letter that you will find on the ignition modules connector. They fit a variety of European cars in the 1980s like BMW Audi Porsche etc. You should have battery voltage w the key in the start and RUN positions.
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The module is essentially an amplifier with a built in analog to digital convertor. Test for power at the pink BAT terminal. Just a matter of getting the polarities correct. The trigger signal rises from 0 V to about 4 V at coil switch-on and then returns to 0 V at coil switch-off.
