1972 Ignition Coil "Resistor Thing"

Found on our 1972 Satellite Sebring Plus 318 Auto: was this installed on the positive or negative terminal of the ignition coil? Thank you.

Dibbons said:

Found on our 1972 Satellite Sebring Plus 318 Auto: was this installed on the positive or negative terminal of the ignition coil? Thank you.

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The pictured item is a radio noise suppression capacitor. It was used as original factory equipment. The style of the one pictured looks like an original Chrysler part.

The radio interference suppression capacitor attached to the coil is one of three interference suppression capacitors in the ignition and charging systems for contact point ignition systems, technically four for factory electronic ignition systems. These capacitors, also referred to as condensers, filter transients on the +12 volt ignition, charging regulation, and supply feeds at points that might cause radio interference, or noise.

For more information, see the Accessories Group Section (1), in the sub-section about Radios and Antennas of the factory service manual. Different years have some differences in details. The ignition coil primary radio interference suppression capacitor is not shown on the wiring diagrams until it was integrated into the wiring in 1978.