Originally Posted by Cab_Burge
Originally Posted by Sammy
Originally Posted by Cab_Burge
The ballast resistor has two feeds from the ignition switch, one from the run position and one from the start position for feeding the coil + side 12.+ V when the starter is engaged. Once you turn the ignition switch in the run position you should see 12.+ volts on one side of the ballast resistor and around 6.0 to 8.0 volts on the other side going to the + side of the coil. scope
You should also see 12.+ V on the + side of the coil when you have the ignition switch in the start position also scope
If you have both of those voltage I would think the Pertronix module is the problem work shruggy
Do you have a trouble shooting procedure for the Pertronix unit?



Only getting 5.5 at the positive side of the could in the on position. Is there a way to bypass the ballast resistor temporarily to see if the car starts?
If I dont have 12 volts at the ballast resistor, what is the fix for this?
This is normal, now get someone to hold the ignition switch in the start position after you are ready to read the voltage going to the + side of the coil when the starter is wroking scope
let us know that voltage thumbs
Did you check the voltage on both sides of the ballast resistor with the ignition switch on? If not do that, one side should read around 12.+volts and the other side should read less than 8.0 Volts if you check it before it warms up and creates more resistance which will read less voltage like you have seen.