2. Relays may be classified as the normally opentype or the normally closed-type, depending on their contact construction. The normally open-type • When a normally open relay as illustrated here is checked, there should be no continuity between terminals 30 and 87 when the relay is de-energized. There should be continuity between terminals 30 and 87 when battery voltage and ground are applied to terminals 85 and 86. The relay condition is determined by this check. The normally closed-type • When a normally closed relay as illustrated here is checked, there should be continuity between terminals 30 and 87 when the relay is de-energized. There should be no continuity between terminals 30 and 87 when battery voltage and ground are applied to terminals 85 and 86. The relay condition is determined by this check. The NO NC (Changeover) type • It has 2 relay out pins. One will be in contact in the changeover state as in NC relay. When it is energized it brakes the NC contact and connect the other output pins. NOTE The De-energized state means that no current is flowing through the coil. The energized state means that current is flowing through the coil. NOTE Check the relay in both condition, i.e. energized and not energized. NOTE Check the relay in both conditions, i.e. Energized and not energized. Low Voltage Electrical System (LV) 184
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