Quick Question Coil issue or more? (Mopar but not A-body)

1...Clip your meter to coil + and to ground. Turn key to run and read. It should NOT read full battery, but rather, 6-10V or so. This shows that the coil is drawing current, and is dropping voltage through the resistor

2...Now Turn key to start and read meter while cranking. It should now read really close to whatever cranking battery voltage is. You can double check by moving meter to battery +, crank, and read. If battery pulls down to 11.5 at the batter, cranking, then coil + when cranking should be close to that

With key in run, "rig" a test gap direct to coil tower. Remove dist. pickup connector and tap the bare side to ground. The engine bay end, not the dist end!! Each time should result in one nice hot blue snap

3...ECU MUST MUST be grounded. If reading (1) in "run" is high, close to full battery, check if box is grounded. Put your meter on block ground, and to ECU metal case. If it shows any voltage, it is NOT grounded.

If you suspect coil, you can disconnect either wire, and check continuity.

Examine pickup/ reluctor for rust, damage, debri.

Vigoursly work all connectors in/ out, the dist, the ECU, and connectors on ballast. The dist connector is especially vulnerable, as it has no real current. Examine it with a light for corrosion, and "work" it in/ out several times to "feel" for tightness and to scrub the terminals

You can get some idea of the distributor pickup IF the "tap" test above produces a spark, but witht the dist connected, it does not, by connecting the dist connector to your meter and cranking engine, and with meter on low AC volts (AC, not DC) the meter should produce about 1V AC