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If you mean the relay that controls the starter motor then it is fairly simple. There are 2 possible faults.

1) The relay is working, but is broken or burned out internally. You will hear a click from the engine bay when the key is turned but the starter motor will not do anything, not even engage.

2) The relay is broken. In this case nothing at all will happen when the key is turned.

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Q: How do you know ignition relay faulty?
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