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Home >> Plymouth >> 1978 >> Horizon Standard Trans >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Speed Control Systems -- Automatic >> Testing >> Servo Unit >> Locking Coil Test
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Locking Coil Test

Turn ignition switch to "ACC" or "ON" position and move slide switch to "ON" position. Momentarily disconnect and connect the double connector at terminals at servo. A clicking sound should be detected in servo. If no clicking sound is heard, replace servo.