1972 Dodge Charger 440 dizzy wiring question

[Kobrak]

So I have kind of an interesting setup here with what appears to be a completely stock ignition setup with the exception of an MSD distributor cap. The first two pictures show what is not hooked up from the factory wiring harness. The third picture shows the two wires from the factory harness to the coil that are hooked up. Shows a black/yellow strip wire to coil ground. I also have the orange wire from the msd cap going to coil ground and also the red from msd cap to plus on the coil.

I currently have no spark. I see around 4.4vdc at the coil with the key in run position. From reading through several threads, I guess the 4.4 is not enough. It was mentioned in one thread I should focus my effort at the bulk head first? Let me know your thoughts on this if you could! Thanks! We are getting closer to first fire!

 

[493 Mike]

You must have a MSD distributor too. OEM units do not have ears for cap mounting. Do you have the instruction sheet for the MSD unit?
Mike

 

[RemCharger]

Looks like a straight fwd ready - to- run.

 

[BeepBeepRR]

OE distrubutors would have clips that hold the cap on if im not mistaken. Pretty sure you have an MSD RTR distributor like Rem said.

Trace this wire back and I bet it goes to either a Orange/Chrome or Blue Mopar ECU. If that is a RTR distributor you wont need to use that. Wire it as the above picture shows.

ECU looks like this.

 

[RemCharger]

Couldn't be a simpler setup. Just need to pull the run power AND start power together as a feed.

 

[Kobrak]

You must have a MSD distributor too. OEM units do not have ears for cap mounting. Do you have the instruction sheet for the MSD unit?
Mike

Sorry, should have mentioned I do have the MSD dizzy also

 

[Kobrak]

Looks like a straight fwd ready - to- run.

Yeah, so about 4.4 at the coil in run is cool?

 

[Kobrak]

Yeah, so about 4.4 at the coil in run is cool

 

[RemCharger]

Yeah, so about 4.4 at the coil in run is cool?

Not cool. That distributor wants at least 12v. Now the fun of diagnosing where the voltage reduction is.