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to properly test relay you must have relay in circuit apply voltage to pin 1 if there is no diode there will not be a polarity issue. if there is a diode you must apply voltage to proper pin or you will have a short circuit. apply ground to pin 2 with coil energized there will be continuity across the other pins when voltage or ground is denied there will be no continuity. to properly test relay you must have relay in circuit apply voltage to pin 1 if there is no diode there will not be a polarity issue. if there is a diode you must apply voltage to proper pin or you will have a short circuit. apply ground to pin 2 with coil energized there will be continuity across the other pins when voltage or ground is denied there will be no continuity.

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Q: My 2000 Nissan Altima has a relay at the ECM How do I check this 4 pin relay 1 and 2 is resistance and 3 and 5 are normal open The socket has a 12 vdc wire?
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