How do I check a relay to see if it is good or bad?

Hello,

You check a typical relay using a multimeter.

Take a look at this guide, it shows step by step testing a relay and also what to look for when you are diagnosing relay issues:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Feel free to let me know what you are experiencing.
Thank you.