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GMC
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1969
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C35/C3500 Pickup 5.7L Eng, Not Available Trans, Gas
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Repair and Diagnosis
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Engine Performance
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Ignition System
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DELCO-REMY Transistorized
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Testing & Trouble Shooting
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Testing
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Diode D1
Diode D1
If both readings are zero, diode is shorted; if both readings are infinite, diode is open.