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remove coil wire from dist. have assistant crank engine over hold coil wire with insulated pliers about .05 inch from engine look for spark while assistant cranks engine. if you have spark . remove a spark plug wire do same spark test if you still have spark rotor is good, if not rotor is bad or another problem inside dist. also you look for corroded or burned spots on rotor or dist. cap

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Q: How do you know if the distributor rotor has gone bad on a 78 Chevy pickup?
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