Transcription of UNDERSTANDING RELAYS - Autoshop 101
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UNDERSTANDING RELAYSPage 1 , All Rights Reserved. This Automotive SeriesUNDERSTANDING RELAYShas been developed byKevin R. SullivanProfessor ofAutomotive TechnologySkyline CollegeAll Rights ReservedRELAYSR elays are used throughout the automobile. RELAYS which come in assorted sizes, ratings,and applications, are used as remote control switches. A typical vehicle can have 20 relaysor RELAYSPage 2 Autoshop , All Rights LOCATIONSR elays are located throughout the entire vehicle. Relay blocks, both large and small, arelocated in the engine compartment; behind the left or right kick panels, or under the dashare common locations.
NORMALLY CLOSED RELAYS The operation of a Normally Closed relay is the same to that of a Normally Open relay, except backwards. In other words, when the relay control coil is NOT energized, the relay switch contacts are closed, completing the circuit through pins 2 and 4. When the control coil is energized, the relay switch contacts opens ...
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