Hi Guys,  Installed a petronics ignitor in my 54 according to the instructions that came with it & the engine started up but ran terrible. I got a 6 volt one, but I have changed the car to 12 volts with a Ballast resistor before the coil.. Checked the voltage on the + side after the resistor of the coil when it was running & got 7 to 8 volts.  On the - side I only showed 3 to 4 volts??? Why the voltage drop?  I checked the braided ground wire in the distributer & it is hooked up.  I changed coils & got the same.  Like to get it right so I don't burn up the expensive module.

  Any help would help would be appreciated for this weekend Mechanic.      Thanks, Mike