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Home >> GMC >> 1974 >> Magnavan >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Computer Command Control >> Maintenance & Testing >> Time Delay Relay

Time Delay Relay

Remove temperature switch wire at temperature switch. Turn ignition switch on. Solenoid should energize for 20-25 seconds and then de-energize. If it does not de-energize, remove purple lead from delay relay. Solenoid will de-energize, delay relay is faulty.