Dead AGAIN!!! AHHG..

[Canadian1968]

That made my head hurt!! Hahah

I understand why it's down to 9.5v at the coil that's what I want . I am asking is 11.5 v not to much for the coil consistant at cruise? I might as well have it hooked right to the battery??

[flyinlow]

I checked the "70 which has the single ballast resistor Mopar EE. MSD Blaster coil. Came with the car.

At idle - system 13.4v , Coil 6.9V

2500rpm- system 14.4v , Coil  10.1v

You said you had 3 ballasts, running the highest resistance one should reduce the voltage at the coil.

I don't live in fear driving around in 40 year old car.  I carry a spare cap, rotor, coil wire, long sparkplug wire (headers), ballast resistor and a spare ECU from my '73.

On the '73 which has a MSD box I carry a spare cap, rotor, coil wire, plug wire (headers) and an old points/condenser distributor. They are getting dusty.

After market ignitions have some advantages , but when your MSD, Firecore or whatever box quits 300 miles from home Sunday afternoon good luck getting parts quickly.

[Canadian1968]

Hmm ok, so you are getting increased voltage at the coil.  The current resistor is .8 I will throw in the 1.4 that will help keep the volts down. Thank you!

[Canadian1968]

I tried the 1.5 Ohm resistor. This gave me 4.6V @ Idle and 9V at @ approx 2500 . I didn't like the low 4.6 so I tried a 1 ohm resistor.
Now I am getting 8.6V @ idle and 10.8 @ 2500 rpm.  I think that is a happy medium

I found it interesting that the coil seem to be running fine off only 4.6V

Everything seems pretty good now, I am reading only .2 of voltage drop from the positive post of the battery to my blue wire on the ballast while running. That makes me feel pretty confident that all my connections are good and solid.

[flyinlow]

Sounds like a good choice . 

I found it interesting that the coil seem to be running fine off only 4.6V

Running fine warmed up with no load on the engine, yes.  Cold start or WOT where the coil needs to work harder to fire the plugs might be a different story.