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Home >> Chevrolet >> 1974 >> Forward Control 4.8L Eng VIN T, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Ignition System >> Transmission Controlled Spark System >> Operation >> 1970 Relay Switch
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1970 Relay Switch

Relay is an electrically operated on-off type switch. When coil is energized through temperature switch, it opens normally closed relay points thereby opening circuit to vacuum advance solenoid, which then de-energizes and opens vacuum port providing vacuum to distributor vacuum advance unit.