• Recent Forum Posts


    Bit by 50,000 volts!

    I also experience this kind of matter and lucky i am that all the electricity is trowing away people unlike before ,that incident happen when i am doing

    ward2014 Yesterday, 12:23 AM Go to last post


    Sorgo is a unique service that accelerates the organic growth of your business and your brand, by mining the power of social media platforms. We are the

    dennis606 07-18-2014, 12:37 AM Go to last post

    Good cheap multimeter?

    Sometimes cheap one are not really good that why sometimes even it is expensive i still choose the product that has a name cause for me that is safe.In

    ward2014 07-17-2014, 10:28 PM Go to last post

    The Hangover Part 3 Movie Download Good Quality

    Thanks for the link if i got time i will download it .

    ward2014 07-17-2014, 10:25 PM Go to last post


    Hello my name is Ward and i am new in this forum.

    ward2014 07-17-2014, 10:21 PM Go to last post
  • How to test electrical relays

    Relays are commonly used as a switching device. A relay has a coil inside that when energized will actuate the contacts and transfer current from the input contacts to the output contacts. The internal coil has a power input and a ground. It takes both the power and ground to operate. Most relays will either be waiting on a power input or a ground connection.

    Relay Test

    Step 1- Find the relay's normal coil resistance.

    This is the amount of resistance from the coil's power input to the coil's ground input. You might find this information in the service manual of the component the relay goes to, or by researching on the internet.

    Power Relay

    Car Relay

    Step 2- Locate the power and ground contacts of the coil.

    Find the two contacts of the relay which are commonly numbered x1 and x2. The power contact supplies voltage to energize the coil, and the other contact supplies the ground.

    Step 3- Test the resistance of the coil.

    Place your multimeter in the Ohms resistance setting and touch a meter lead probe to each contact found in step 2. The reading should be some amount of resistance across the coil. Compare your reading with the relay's standard resistance found in step 1.

    Step 4- Review the test results.

    If you measured no movement, or an O.L., then the relay is electrically open. If you measured close to zero Ohms, then the relay coil is shorted to ground.

    Please login at the top of page, or register to post a comment.

    Get OhmCheck's Bonus Info & Tips (FREE)