Throwing my hands up on this ignition!

Stock ECM coils need 9-12 Volts DC and do require a lot of amps to fire. The coil and ballast resistor MUST add up to 1.9-2.0 Ohms or you take a chance of burning the ECM out. A 1.4 Ohm coil and 0.5 Ohm Ballast resistor = 1.9 Ohms.

Multy Spark Discharge (MSD) is not just MSD Corp and when most throw out the letters MSD you tend to think they have a MSD Corp box. I have a Mallory VI AL Multy Spark discharge that is a CDI type. It was made before MSD Corp and Mallory merged.

• When it is turned on but the dizzy is not triggering it, there is almost ZERO volts at the coil.
  
• DO NOT TOUCH the + and - wires when it triggers.
  
• Most of these 'MSD' boxes still want a 1.4 ohm coil but also a tight 100 winding inside. E type coils work well most times. The Chrysler 2.2 one is a good one as is the Ford unit someone said above.
  
• Do NOT use the low ohm Pertronic's coil on these boxes.
  
• The Voltage to the RED and BLACK thick gauge wires for these boxes should be between 11 and 16 Volts DC and around 15 AMP's.
• The smaller RED and BLACK wires are the ONLY wires to the coil. These will have no voltage at no trigger but 300-500 Volts at triggered but almost NO amps.
• If you KNOW what you're doing you can change the spark characteristic by changing the Coil's winding ratios. Many Ytube vids on this.

Almost all new ECM's are just a GM HEI type system inside and that big 'Transistor on it is FAKE. It is so easy to mount and wire up a HEI module and it will trigger off a Mopar factory Electronic Dizzy. Run a good E coil and have 65K+ volts at the plug. These MUST be grounded. Some HEI modules may have a bit of timing pull out as the RPM's go up, so do some research.

On my sons 1974 D200 we did relays for the power under the hood including one for the ignition. One key on 'Power Distribution' relay to bypass the wiring going thru the bulkhead connectors.