Pick-Up Coil Resistance And Short Check

Turn the ignition switch "OFF". Disconnect 2-wire distributor connector. Connect an ohmmeter set in the x100 scale with one lead touching each terminal of distributor harness connector. See Fig 1.

Fig 1: Ohmmeter Hookups for Pick-Up Coil Resistance and Short Check
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Replace pick-up coil if not to specifications.
Pick-up coil resistance should be 700-800 ohms. If not, replace pick-up coil assembly. If system works intermittently, be sure pick-up coil wire in distributor is properly grounded. See Fig 2.

Fig 2: Interior View of Marelli Distributor
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Trigger is integrally mounted on distributor shaft.
Next, attach ohmmeter leads to either terminal of distributor connector and to distributor housing. An infinity reading should exist. See Fig 1. Also check air gap.