What is the reading on an ohm meter if a relay is good?

If a relay is functioning properly, an ohm meter should show low resistance (typically close to zero ohms) across the relay's coil terminals when it is energized. For the contacts, the resistance will be low (again, close to zero ohms) when the relay is activated and the contacts are closed, while it should show high resistance (infinite or very high ohms) when the relay is deactivated and the contacts are open. A reading outside of these expected ranges may indicate a faulty relay.