BALLAST RESISTOR........WHAT GIVES?

CFD244 said

Hi Folks

What exactly does the reduced run voltage in the resistor circuit protect? Points (old system), pick-up, control module or coil?

Click to expand...

Points.
Coil.
and on original '5 pin' electronic control unit, the second resistor (5 ohms) is for the ECU.

The pickup sends a small magneticly induced pulse to the ECU. The ECU amplifies it so the solid state electronics do the same job as points, open and close a switch to let power flow through the coil primary windings.

see page 5 "Ignition Systems for 1972" Master Technician Service Conference - Chrysler's Training for Mechanics