1965-1967,1968-1974 Ignition System Condenser. A Fresh, Fully Functioning ACDelco Condenser Is Essential To Proper Ignition And Performance.

A condenser prevents arc damage across the ignition points and prolongs the discharge of electricity through the coil. Generally they're not tested, they're usually just replaced outright along with the points. Testing, though, can be performed by checking for leakage with a multimeter. A good condenser should show infinite resistance.