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|08-22-2012, 11:55 AM||#1|
2002 XLT V6 4x4
Join Date: Feb 2010
Mentioned: 2 Post(s)
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Quoted: 49 Post(s)
How To: Test a Relay
I noticed that several people have been asking how to test a relay lately, so I worked this up. Enjoy.
Be sure to check out my other write-ups:
How To: Replace Blend Door Actuator in 3rd Gen Ex
How To: Remove/Replace 3rd Gen Door Panel
How To: Install Signal Mirrors On 3rd Gen Ex
How To: Restore Faded, Yellowing Headlights
How To: Replace Multifunction Switch in 3rd Gen Ex
How To: Paint Rear Pillar Trim
How To: Replace 3rd Gen Ambient Air Temperature Sensor
How To: Remove/Replace 3rd Gen Center Console
Here is a basic automotive relay:
With no power on the coil there is a connection between pins 30 & 87a (closed), and no connection between pins 30 & 87 (open), as shown in the picture.
When power is applied to the coil (pins 86 & 85), there is a connection between pins 30 & 87 (closed), and no connection between pins 30 & 87a (open).
To test the relay, disconnect all wiring or remove it from it's socket. For the tests listed below, the meter will be set on Continuity/Resistance.
Step 1 is to test the Coil:
Step 2 is to test the Normally Closed Terminals :
Step 3 is to test the Normally Open Terminals :
If at this point the relay has proven to be good, The next step is to test that it functions properly when the coil is energized.
Step 4 is to test the Actual Function of the Relay :
Hope this helps out and didn't confuse you too much!
Rondo - USMC, Combat Engineer, 1983-1996
Click here for a list of my write-ups!
Last edited by BigRondo; 08-24-2012 at 11:33 AM. Reason: Added Links
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